FAQs

Vapor corrosion inhibitors (VCI) are substances that slowly release a corrosion preventative compound into a sealed air space, effectively protecting exposed metal surfaces. VCIs are often used in situations where it is impractical or undesired to use rust preventative liquids or other surface treatments.

VCI stands for Volatile or Vapor Corrosion Inhibitors. ZERUST® applies VCI technology to inhibit corrosion on metal surfaces. VCI film is packaging that generally consists of polyethylene film that has been impregnated with chemical formulations that are unique to each manufacturer. While the underlying formulations can vary significantly, the finished products function similarly in that they release very low concentrations (typically in parts per ten-thousandth) of invisible corrosion inhibiting vapors into the surrounding air. The vapor molecules subsequently condense onto exposed metal surfaces and form a molecular corrosion shield that can protect against rust and other forms of corrosion for many years. Typical service life is up to three (3) years and even longer in some cases. When the VCI packaging is later removed, all vapor corrosion inhibiting molecules rapidly evaporate. This leaves the metal parts clean and ready for immediate use.

Corrosion is the chemical or electrochemical reaction between a material, usually a metal, and its environment that produces a deterioration of the material and its properties. Usually, corrosion is the oxidation of metals in the presence of water or water vapor and is known as rust (iron, steel), white rust (galvanized steel), and other terms of corrosion failures such as tarnish, pitting, and flaking.

ZERUST® VCI products prevent corrosion in several ways:

1. By acting as a protective barrier from external corrosive atmospheric elements such as abrasion, water, dirt, and acid gas pollutants.
2. By emitting Volatile Corrosion Inhibitors that passivate the electron flow between the anodic and cathodic areas on metal surfaces and interrupt the electrochemical corrosion process.
3. By adding water repulsion properties to the metal surface, which inhibit water from permeating the metal surface and providing the electrolyte for corrosion reactions.

The vapor corrosion inhibitor portion of ZERUST® VCI products is made of proprietary chemical formulations that are invisible, odorless, non-toxic, non-reactive, non-flammable, and non-allergenic. These chemical formulations release a corrosion inhibiting vapor that diffuses throughout an enclosure that either contains VCI formulations or is made from VCI materials and settles on exposed metal surfaces to form a microscopic corrosion inhibiting layer.

This protective layer will remain on the surface of the metal if there is no significant, continuous exchange of air within the enclosure. Ideally, there should be less than one air exchange per day (for example, when an electrical cabinet or package is opened briefly and occasionally). Once the metal part is removed from the enclosure, the corrosion inhibiting layer is no longer kept in place by equilibrium with the VCI source, and it dissipates from metal surfaces (typically within about an hour), leaving the metal part clean, dry, and corrosion-free.

The vapor diffusing properties of our corrosion inhibiting formulations offer an important advantage over conventional inhibitor coatings since the traces of these gas molecules penetrate hard-to-access crevices, gaps, and slots. They also cover the surfaces of complex-shaped articles that are difficult to coat. They are adsorbed onto the surface of the metal to form a corrosion inhibiting protective layer that is just a few molecules thick. ZERUST® VCI products may also include acid gas absorbing chemicals in the packaging material to act as a barrier and add another dimension to the protection of the metal content. These “scavenging” chemicals react and neutralize the polluted air that may diffuse through the ZERUST® VCI material. Also used are various combinations of physical barrier properties that optimize the corrosion prevention and physical protection needs of our customers. These may range from plain low-density polyethylene (LDPE) material to combinations of higher strength, higher tear resistance, higher resistance to sunlight or UV, static charge dissipation, and lower diffusion for moisture or acid gas molecules.

ZERUST® VCI products offer corrosion protection without having to be in direct contact with or coated onto the parts that are being protected. Metal parts merely need to be enclosed in or with a ZERUST® VCI product (where airflow is minimized) for protection to occur. With ZERUST® VCI packaging, it is no longer necessary to apply messy oils, greases, and other corrosion protection compounds and incur the cost of their removal.

Nitrates (NO₃ – one nitrogen and three oxygen molecules) are compounds that occur naturally in soil. Consequently, nitrates are also present naturally in root vegetables like carrots and potatoes, as well as leafy green vegetables. Nitrates are not generally harmful unless they are consumed in massive quantities. When we eat nitrates, they are converted into nitrites in our digestive system.

Nitrites are also compounds made up of nitrogen and oxygen, but instead of three oxygen molecules, they have only two (NO₂). Nitrite compounds combine with other elements like sodium and potassium to make sodium nitrite or potassium nitrite, which are used as preservatives and color fixatives in cured meats. Nitrites are particularly good at preventing botulism – an anaerobic form of bacteria that causes paralysis and death – which is why small amounts of sodium nitrite are required by law to be added to cured meats. Nitrites too, on their own and in moderation, are also generally not harmful.

Sodium nitrite, however, isn’t just a good food preservative, it’s also an excellent corrosion inhibitor. That’s why, when NTIC developed and commercialized the first-ever VCI rust preventative plastic packaging, the active chemical protection system was formulated using common food additives, including sodium nitrite. Conservative chemists generally do not recognize sodium nitrite itself as a vapor corrosion inhibitor because, on its own, it has a vapor pressure so low that it is almost immeasurable. When used in combination with other additives in proprietary ZERUST® formulations, sodium nitrite can be effective “VCI activated”. The ZERUST® VCI effectiveness has been proven in commercial and military applications worldwide, as well as scientifically by recognized standard test methods for vapor corrosion inhibitors used by U.S. and NATO military organizations.

Nitrites in VCI products are a commonly misunderstood safety concern because of the historic use of the specific compound, dicyclohexylamine nitrite (or dicyclohexylammonium nitrite). Sometimes referred to by the brand name “Dichan”, dicyclohexylamine nitrite is a vapor corrosion inhibitor that was first used in VCI paper production in the 1940’s. Later, in the 1970’s, toxicologists started to become aware that compounds using both amines and nitrites in combination could lead to the formation of “n-nitroso amines”, which are believed to be both carcinogenic and genotoxic. It is for this reason that VCI products produced in most advanced industrialized nations no longer use dicyclohexylamine nitrite. ZERUST® VCI packaging has never contained dicyclohexylamine nitrite and, furthermore, does not use amines of any kind because they are known to be skin and respiratory irritants.

Depending on the design of the corrosion prevention solution, some ZERUST® VCI packaging products may be produced from low and high-density polyethylene resins that are resistant to vapor penetration. Some atmospheric moisture will eventually find its way into a closed package. The presence of moisture in a package can be expected during shipments across areas of high humidity.

When moisture permeates through the ZERUST® VCI plastic packaging products (flexible and rigid), the moisture is affected by the vapor corrosion inhibitors that are present in the VCI product. As a result, the ZERUST® VCI products inhibit corrosion despite a low level of moisture passing through the plastic. Corrosion problems arise when moisture can enter a package unimpeded by the packaging products, such as through an incorrect closure or a significant hole in the package. For example, when there is a significant breach in the package, the corrosion inhibiting molecules can escape, breaking up the protective corrosion inhibiting molecular layer that had formed on the surface of the metal. Therefore, an unimpeded airflow into the package must be avoided.

ZERUST® VCI technology provides active corrosion protection. ZERUST® products release invisible, odorless, non-toxic vapor corrosion inhibitor (“VCI”) molecules. A ZERUST® bag, for example, will actively continue to release VCI molecules until the air inside the bag is completely saturated. The protective ZERUST® VCI molecules will then adsorb themselves to all the surfaces on any metal product(s) inside this bag, forming a transparent, self-repairing, rust-protective layer. This nano-layer of corrosion preventative molecules, in turn, actively passivates the metal surfaces, thereby preventing electrochemical reactions that might otherwise cause rust or corrosion.

Desiccants provide passive corrosion protection. Just like a sponge, desiccants absorb moisture from the surrounding atmosphere. The reduction in ambient humidity can prevent the formation of electrolytes on metal surfaces that might otherwise activate electrochemical corrosion reactions. However, desiccants have a very finite limit to the maximum amount of water they can absorb. Once this is exceeded, desiccants cease to provide any further protection. Worse, they may even leak moisture back into their surroundings.

ZERUST® VCI paper/plastic packaging does not affect the functionality of electronic circuitry, nor negatively react with non-metallic surfaces such as plastics, rubbers, or wood. However, since there are so many possible combinations of chemistries, materials, processes, and substrates, we always recommend contacting a ZERUST® account manager to validate the application. Other rust prevention methods such as oils, greases, and other liquid RPs (rust preventatives) pose a much higher likelihood of reacting with plastics, rubbers, and wood.

When a corroded item is packaged in ZERUST® VCI products, the corrosion process is slowed. However, our packaging products cannot remove corrosion that has already formed.

When wet parts are packaged in ZERUST® VCI products, a certain amount of corrosion can be anticipated to take place. The amount of corrosion will be a function of the time it takes for the active corrosion inhibiting molecules to saturate the package enclosure, the corrosion inhibiting effectiveness of the designed VCI system, the amount of moisture on the part, and the pH and contamination of the water itself.

Yes, since solvent coatings dry to a thin coating on the metal surface, they are fine to use with ZERUST®/EXCOR® VCI bags and film. However, if not properly dried or if overapplied, a heavy coating may affect the performance of the VCI bag by keeping the vapor corrosion inhibiting molecules from reaching the metal surface. Please contact ZERUST®/EXCOR® to determine the suitability of the solvent rust preventative and application.

Tests performed with electron spectroscopy for chemical analysis (ESCA) show that 2-4 hours after a steel panel is removed from a ZERUST® VCI package, all traces of the corrosion inhibiting molecular layer are gone from the surface of the part.

The period of time before one can expect corrosion to occur on a part depends on the cleanliness of the part and the environment around the part (relative humidity, presence of pollutants or wood, temperature, etc.)

The time required for active corrosion inhibiting molecules from a VCI product to saturate a package is a function of the volume and temperature of the package. Therefore, protection begins as soon as corrosion inhibiting molecules reach the metal surface, and maximum protection is achieved when the entire environment of the package is saturated with the corrosion inhibiting molecules.

Test data show that ZERUST® VCI products do not adversely affect electrical and electronic components. In fact, the corrosion inhibiting molecules help improve the reliability of electrical and electronic components by preventing corrosion that is too small to be seen by the naked eye. Therefore, it is safe to use ZERUST® VCI packaging products to prevent corrosion of any instruments, devices, and equipment that contain electric and electronic components.

Test data and review of corresponding scientific literature show that there are no inhalation or contact risks with ZERUST® VCI products. ZERUST® VCI products have been reviewed and cleared for use by factory, government, and military personnel by the appropriate occupational health departments, including those of most major automotive manufacturers worldwide.

ZERUST® has extensive experience in corrosion prevention and remediation for the military. Many ZERUST® products have Mil Specs, NSN numbers and are listed on the GSA schedule. We are dedicated to serving all branches of the military and their unique needs. Contact customer service for military applications and sales inquiries.

Keep VCI products in original packaging until use. Store in a dry, covered warehouse between 0°F to 85°F (-18°C to 29°C) with a relative humidity of less than 60%. When not using ZERUST® VCI material for an extended period, enclose it in airtight plastic packaging to prevent atmospheric contamination and preserve the VCI. Reclose packaging at the end of shifts or during downtime.

There are many ways to prevent corrosion, including modifying the atmosphere by dehumidification, nitrogen purge, evacuation, etc., and creating a barrier on the metal surface to prevent the permeation of moisture. This barrier can be formed by liquid coatings, such as oil, or via packaging products that contain VCI or Vapor Corrosion Inhibitors. Vapor Corrosion Inhibitors work by diffusing corrosion inhibiting molecules from a source (packaging film or paper, for example) to metal surfaces. These molecules settle on metal surfaces and form a protective corrosion inhibiting layer that inhibits the electrochemical reactions that cause corrosion to form.

ZERUST® combines the use of vapor corrosion inhibitors with material sciences and process management expertise to implement custom corrosion solutions for a customer or throughout an entire supply chain. We call this our ZERUST®/EXCOR® Integrated Corrosion Technologies or ICT®.

Yes. Our internationally recognized scientists and corrosion engineers work closely with customers to design and implement comprehensive corrosion management systems. As part of the validation process, customer parts along with proposed rust preventative solutions can be subjected to accelerated corrosion testing in the various climate stress simulation chambers available at our technical support laboratories that are strategically located in major industrialized regions around the world.

VCI Paper or Vapor Corrosion Inhibitor paper is a kraft packaging paper manufactured with added VCI chemistry. VCI molecules protect metals from corrosion by forming a thin, invisible layer on the surface. This layer inhibits the corrosion process caused by oxygen, water, and contaminants. Vapor Corrosion Inhibitor paper can be made in different sizes, weights, and inhibitor types. It can be ordered in rolls, pre-cut, and with custom printing. VCI paper is typically a kraft material but can be reinforced with a poly layer or scrim-like threads for additional protective properties.

The ZERUST® SDA Advanced VCI film can be vacuum sealed for extreme long-term protection in acid gas environments.

VCI Bags, or Vapor Corrosion Inhibitor bags, are made with poly packaging film converted to a bag manufactured with added VCI chemistry. VCI molecules protect metals from corrosion by forming a thin, invisible layer on the surface. This layer inhibits the corrosion process caused by oxygen, water, and contaminants. VCI bags are typically used when you want to protect metal parts from rust during storage or shipment but don’t want to paint or coat the parts in a rust preventative coating.

VCI Paper, or Vapor Corrosion Inhibitor, paper emits VCI molecules that settle on metal surfaces and form an invisible layer that protects from rust and corrosion. VCI Paper protects by interrupting the electrochemical corrosion process caused by moisture, oxygen, and contaminants in the atmosphere.

VCI Emitters (also known as VCI diffusers) emit powerful ZERUST® corrosion inhibiting molecules into an enclosure that settles on metal surfaces and protect them from rust and corrosion. VCI Emitters provide targeted corrosion protection in hard-to-reach enclosed spaces for electronics or can be used as added protection to ZERUST® VCI packaging products.

The compounds that VCIs release into an airspace actively prevent corrosion by forming strong bonds with a metal surface, promoting and maintaining the natural and healthy passive oxide layer on the metal. The VCI layer that forms is invisible, dry, and does not affect the physical properties or functionality of the metal in any way. Therefore, the protected metal can be painted, treated, and/or used straight out of the ZERUST® packaging without further cleaning.

VCI bags, or vapor corrosion inhibitor bags, emit VCI molecules that settle on the metal surface and form an invisible layer protecting from rust and corrosion. VCI Bags protect against corrosion by interrupting the electrochemical corrosion process caused by moisture, oxygen, and contaminants in the atmosphere.

“VCI” stands for Vapor corrosion inhibitors. These corrosion inhibitor compounds emit from the VCI paper, film, or emitter and settles on the metal surface to form an invisible layer that prevents oxidation by interrupting the electrochemical corrosion process caused by moisture, oxygen, and contaminants in the atmosphere.

Rust inhibitors are commonly chemicals added to a substance to prevent corrosion or slow down the oxidization process. The inhibitor molecules attach or coat the metal surface by forming a thin protective film either by itself or in conjunction with metallic ions, providing a protective barrier film that stops the corrosive reaction from developing.

ZERUST®/EXCOR® offers a wide range of rust inhibitor coatings ranging from oil-based, solvent-based, water-based, and grease-based to oil additives for the protection of parts in-between production processes, storage, or for added protection to our ICT® Poly Packaging and ICT® Kraft Packaging Paper.

ZERUST® ICT® VCI paper works best when metal parts are wrapped or layered with VCI paper and placed inside a fully enclosed poly bag, box, or container. Vapor corrosion inhibitors (VCIs) are substances that slowly release a corrosion preventative compound into a sealed air space and actively prevent corrosion by forming strong bonds with a metal surface, promoting and maintaining the natural and healthy passive oxide layer on the metal. The VCI layer that forms is invisible, dry, and does not affect the physical properties or functionality of the metal in any way. The protected metal can be painted, treated, and/or used straight out of the ZERUST® VCI Paper without further cleaning.

For step-by-step instructions on How to Use VCI Paper, click on View Details below!

Volatile corrosion inhibitors (VCIs) are chemicals that can reduce the corrosion rate of metals and alloys. It’s important to note that VCIs are also commonly known as vapor corrosion inhibitors – the two terms mean the same thing. According to the NACE International Standard TM0208, VCIs work by releasing their chemical compounds into the air, which are then transported as vapor throughout an enclosed space. The vapor eventually condenses onto metal surfaces, where it is absorbed and has a hydrophobic effect that helps inhibit corrosion. VCIs are also referred to as vapor inhibitors, vapor-phase corrosion inhibitors, and vapor-transported corrosion inhibitors.

Rust inhibitors, such as ZERUST® Axxanol™, Axxatec™, and AxxaCoat™ products, are designed to prevent rust and corrosion before it starts. They work by creating a protective barrier or emitting vapor corrosion inhibitors (VCI) that safeguard metal surfaces. In contrast, rust converters chemically change existing rust into a stable compound, and rust removers dissolve rust through acidic or chelating action. Each product serves a different purpose; inhibitors are preventative, while converters and removers are restorative solutions.

ZERUST® rust inhibitors are formulated to protect ferrous and non-ferrous metals, including steel, aluminum, copper, brass, and zinc. However, the specific compatibility may vary depending on the ZERUST® inhibitor. It’s recommended to refer to product technical data sheets or consult with ZERUST® technical support to ensure the inhibitor selected is optimized for your metal type and use case.

The duration of protection offered by rust inhibitors depends on the formulation, application method, and exposure environment. For example:

• Axxanol™ Oil-Based Rust Inhibitors provide up to 1 to 3 years^‡ of protection, depending on the specific product and environmental conditions. They are ideal for controlled indoor storage or long-term preservation.
• Axxatec™ Water-Based Rust Inhibitors offer up to 3 to 12 months^‡ of protection and are preferred for applications that require easier cleanup, quick drying, or environmental compliance.
• Axxanol™ Solvent-Based Rust Inhibitors deliver up to 1 year^‡ of protection and are well-suited for intermittent use or in-process protection where fast-drying films are beneficial.
• Axxanol™ Grease-Based Coatings provide up to 2 to 3 years^‡ of extended protection, even in harsh environments, thanks to their thick, durable barrier.

Exposure to moisture, temperature fluctuations, and handling can affect performance, so it’s important to choose an inhibitor that matches the storage duration and environmental conditions of your application. For longer-term protection, ZERUST® recommends periodic inspection and possible reapplication, depending on the product used.

ZERUST® rust inhibitors are designed to be complementary to ZERUST® VCI packaging products. Using them together, such as applying a rust-inhibiting oil or coating to metal surfaces before enclosing them in a VCI bag, can offer layered protection, especially in aggressive environments or during long-term storage and shipment. This approach ensures that even if the packaging is breached, the contact inhibitor continues to protect the metal surface.

Application methods vary by product type. ZERUST® rust inhibitors may be applied by spraying, brushing, or immersing/dipping, depending on the ZERUST® product, metal, and operational setup. Some products leave a light, dry-to-touch film, while others may leave an oily residue. Removal is generally simple and can be done with mild alkaline cleaners, solvents, or water-based detergents without damaging the metal. Always refer to the product technical data sheet instructions for best practices regarding application and removal.

ZERUST® prioritizes safety and environmental compliance across its product line. Many rust inhibitors are RoHS, REACH, and TSCA compliant and are free from hazardous heavy metals or toxic compounds. ZERUST® offers water-based rust inhibitor options for industries seeking sustainable solutions without sacrificing corrosion protection. Safety Data Sheets (SDS) are available for all products to ensure compliance with local and international regulations.

Rust inhibitors are designed to prevent new corrosion, not treat rust that has already formed. If rust is present, it’s best practice to thoroughly clean the surface before applying any inhibitor. This can be done using mechanical abrasion, chemical rust converters, or a rust remover such as those in the ZERUST® AxxaClean™ series, which are effective even in cracks and crevices.

Once the metal is clean and dry, a ZERUST® rust inhibitor can be applied to provide ongoing protection. Applying inhibitors directly to rusted surfaces can reduce their effectiveness and may trap moisture, actually accelerating corrosion instead of preventing it.

Rust inhibitors that require direct contact can be challenging to apply in enclosures or tight spaces where access is limited. To address this, ZERUST® offers rust inhibitors that feature vapor corrosion inhibitor (VCI) technologies, which provide contactless protection. These inhibitors release protective molecules into the airspace, which diffuse throughout the enclosure and bond to metal surfaces, including those that are uncoated or hard to reach.

This makes VCI ideal for protecting complex assemblies, internal cavities, toolboxes, control panels, and other enclosed areas where traditional application methods are impractical. In addition to VCI emitters, ZERUST® also provides VCI packaging solutions, such as bags, films, and papers, which create a sealed environment to ensure consistent, corrosion-free storage and shipment of metal parts.

While wood packaging and pallets are widely used for storing and shipping metal parts, they can accelerate corrosion when the right conditions are present. Here’s why:

• High Moisture Content: Wood absorbs moisture from its environment. Once its moisture content exceeds 15–18%, it can enable electrochemical corrosion of metals in contact with it.
• Copper-Based Wood Treatments: Many pallets are treated with copper-containing preservatives like ACQ or CA. These treatments release copper ions that migrate through moisture and increase oxidation, especially in steel and galvanized components.
• Wood Chemistry: Even untreated wood emits organic acids (e.g., acetic and formic acid) that lower pH and promote corrosion. Some woods also contain tannins that may influence corrosion behavior.
• Scientific Validation: Lab and field studies confirm that metals—especially galvanized steel—corrode faster when exposed to treated wood and high-humidity environments.

The ZERUST® Solution

ZERUST®/EXCOR® offers an effective and proven solution: use VCI (Vapor Corrosion Inhibitor) poly packaging to isolate metal parts from direct wood contact. ZERUST® VCI films and bags create a controlled microenvironment that:

• Blocks corrosive elements from wood (acids, copper ions, moisture).
• Buffers humidity fluctuations to stabilize storage conditions.
• Delivers invisible, safe VCI protection that settles on metal surfaces and stops corrosion before it starts.

Wood-induced corrosion is a real, documented risk in metal packaging and logistics, but it’s easily preventable. With ZERUST® VCI packaging, you can keep using wooden pallets for strength and cost-efficiency while eliminating the corrosion threat.

Flash rust is a rapid form of corrosion that occurs on the surface of ferrous metals, such as steel or iron, shortly after they have been exposed to water, typically within minutes to hours. This phenomenon often appears as a reddish-brown discoloration and is commonly observed after processes like aqueous cleaning, wet blasting, or machining with water-based coolants.

Flash rust forms when freshly exposed metal reacts with oxygen and moisture in the air, initiating an accelerated oxidation process. The severity of flash rust can vary based on environmental conditions such as humidity, temperature, and the presence of corrosive contaminants.

Preventing flash rust requires immediate protective measures post-exposure, including the application of corrosion inhibitors, drying techniques, or the use of Vapor Corrosion Inhibitor (VCI) packaging. ZERUST®/EXCOR® offers a range of corrosion-inhibiting solutions specifically designed to protect metals from flash rust and other forms of corrosion during manufacturing, storage, and transport.

If you’re looking for the best rust preventative oil for machined steel parts after cleaning, ZERUST® offers a comprehensive range of Axxanol™ coatings engineered for clean, residue-free corrosion protection. Depending on your storage or shipping requirements, Axxanol™ 33, 750-NV, 758-NV, 46-Bio, A35-30, and A35-8030 provide corrosion protection for 1 to 3 years^‡, ensuring machined steel parts remain clean and rust-free after cleaning and before use or assembly.

For applications requiring enhanced protection in voids, crevices, or other hard-to-reach areas, ZERUST® also offers VCI-enhanced oil formulations, such as Axxanol™ 750 and 758, which release vapor corrosion inhibitor (VCI) molecules that migrate to hard-to-reach metal surfaces, providing additional coverage beyond direct contact areas.

Whether your goal is short-term indoor storage, long-term shipment, or extended preservation, ZERUST® has a rust preventative oil for machined steel parts tailored to your specific part geometry, storage conditions, and protection duration. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Flash rust often occurs when freshly cleaned metal parts are exposed to moisture or humidity before a corrosion inhibitor is applied. To prevent flash rust after washing, ZERUST® offers a comprehensive range of part washing fluids with integrated rust inhibitors under the AxxaWash™ series. These formulations are engineered to clean effectively while stopping flash rust formation during the critical transition from washing to drying.

The AxxaWash™ KF-123, KF-124, and KMS-220 products are low- to very low-foaming, mildly alkaline or near-neutral cleaners that remove light to heavy hydrocarbon soils, including machining fluids, oils, and greases. Each product leaves a light, corrosion-inhibiting layer on metal surfaces to prevent flash rusting during handling, staging, or storage. This makes them ideal for manufacturers seeking reliable ways to prevent flash rust after washing without adding extra process steps.

Depending on the type of soil being removed, the metal composition, and the desired protection duration, ZERUST® offers an AxxaWash™ solution tailored to meet specific cleaning and corrosion prevention requirements. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Yes. ZERUST® provides a broad selection of water-based rust inhibitors under the Axxatec™ portfolio, specifically formulated for use in rinse tanks and final-stage rinse applications following metal part washing. When selecting a water-based rust inhibitor for rinse tanks, products such as Axxatec™ 80C, 30C, and 48C deliver reliable corrosion protection while maintaining compatibility with aqueous systems. These inhibitors form a thin, protective film on metal surfaces to prevent flash rust and short- to medium-term corrosion without leaving oily residues.

In addition, ZERUST® offers dual-action water-based rust inhibitors that also function as cleaners, simplifying production processes by combining two steps into one. The Axxatec™ Dual-Action Products (DA-23C, DA-24C, and DA-40AL) remove soils and light contaminants while simultaneously depositing a corrosion-inhibiting layer for extended protection.

Depending on the type of soils being removed, the desired protection duration, and the metal composition of the parts, ZERUST® has an Axxatec™ solution tailored to meet your process and performance needs. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

ZERUST® offers several temporary rust preventative oils for indoor storage designed to protect cast iron and other ferrous metals from corrosion during short-term storage or staging. Additionally, ZERUST® offers water-based, solvent-based, and grease-based formulations that provide varying film types and protection durations to match specific process needs and environmental conditions. These solutions ensure that manufacturers have reliable temporary rust preventative oils for indoor storage suited to each application.

For situations where parts are only stored for a short period before assembly or further processing, ZERUST® VCI Packaging may offer a more efficient solution. VCI (Vapor Corrosion Inhibitor) technology protects metal surfaces without requiring the application or removal of coating, allowing parts to move directly into production without additional cleaning steps.

Depending on the protection duration, part geometry, and subsequent manufacturing processes, ZERUST® provides a tailored, process-specific solution to keep cast iron and other ferrous parts corrosion-free during short-term indoor storage. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

ZERUST® offers several solutions to prevent rust on cast iron parts before assembly, including a comprehensive range of rust inhibitor coatings designed to protect cast iron and other ferrous metals from corrosion during short-term storage or staging. These coatings are available in water-based, oil-based, solvent-based, and grease-based formulations, offering varying film types and protection durations to match specific process needs and environmental conditions. By selecting the appropriate coating, manufacturers can reliably prevent rust on cast iron parts before assembly and minimize rework.

For situations where parts are only stored for a short period before assembly or further processing, ZERUST® VCI Packaging may offer a more efficient solution. VCI (Vapor Corrosion Inhibitor) technology protects metal surfaces without requiring the application or removal of coating, allowing parts to move directly into production without additional cleaning steps.

Depending on the protection duration, part geometry, and subsequent manufacturing processes, ZERUST® provides a tailored solution to keep cast iron parts rust-free and ready for assembly. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Long-distance and overseas shipments present unique corrosion challenges due to high humidity, salt air, temperature fluctuations, and condensation (“container rain”). While desiccants are commonly used, they alone are often insufficient to protect metal parts during extended transit. To address these risks, manufacturers must identify the best rust preventative for overseas shipments based on metal type, packaging method, and expected transit duration. Choosing the best rust preventative for overseas shipments ensures that parts remain clean, dry, and corrosion-free throughout extended transport.

ZERUST® recommends using a comprehensive corrosion prevention system that includes both rust preventative liquids and Vapor Corrosion Inhibitor (VCI) packaging technologies. Rust preventatives, such as ZERUST® Axxanol™ and Axxatec™ coatings, form a protective barrier directly on metal surfaces to prevent moisture intrusion. These can be paired with ZERUST® VCI packaging films and emitters to provide an additional layer of vapor protection inside the container.

The ideal solution depends on the type of metal, the manufacturing and cleaning process, storage duration, and environmental exposure during shipment. As part of the ZERUST® Z-CIS® (Corrosion Inhibiting System) methodology, ZERUST® specialists evaluate each step of the customer’s process, from part washing to final packaging, to identify risk factors and implement the most effective and cost-efficient rust prevention plan.

By combining rust preventative liquids with VCI packaging and process optimization, ZERUST® ensures that parts arrive at their destination clean, dry, and corrosion-free, even after long ocean transits. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Understanding how long rust preventative coatings in humid environments can last is essential for ensuring reliable protection during storage, staging, or shipment. ZERUST® offers several solutions engineered specifically to perform well as rust preventative coatings in humid environments, where moisture, condensation, and temperature fluctuations accelerate corrosion. These coatings are available in oil-based, solvent-based, water-based, and grease-based formulations, as well as oil additives designed for integration into existing fluids or systems.

In humid environments, oil- and solvent-based coatings generally provide the strongest and longest-lasting protection, as they form a durable physical barrier that protects metal surfaces against moisture and humidity. Depending on the product and environmental conditions, ZERUST® Axxanol™ solvent- and oil-based coatings can provide corrosion protection for periods ranging from 6 months up to 3 years^‡.

The ideal coating depends on factors such as metal type, required protection duration, and storage or shipping conditions. With its broad portfolio and corrosion prevention expertise, ZERUST® can provide the optimal rust preventative coating solution to meet specific operational and environmental needs. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Yes. Under the right conditions, water-based rust inhibitors for export shipments, such as ZERUST® Axxatec™ water-based rust inhibitors, can provide effective protection for export shipments. These aqueous corrosion inhibitors deliver strong short- to medium-term corrosion protection, typically up to 3–6 months^‡ when applied correctly. They perform best when shipments are packed in sealed or controlled environments, such as VCI bags, barrier films, or vacuum-sealed packaging, and when metal surfaces are clean and dry prior to application. For maximum performance, the coating should be applied at the recommended film thickness, allowed to dry completely, and ideally used in conjunction with ZERUST® VCI packaging to enhance vapor corrosion protection during transit.

Water-based Axxatec™ products are widely used in export applications because they are safer, more environmentally friendly, and easier to remove than traditional oil-based coatings. However, for long-duration ocean shipments (especially those exceeding six months), high-humidity or condensation-prone conditions, or when protecting corrosion-sensitive metals such as cast iron or bare steel, a ZERUST® Axxanol™ solvent- or oil-based coating is recommended. These coatings provide a durable, long-lasting physical barrier against moisture and humidity, offering protection from six months up to three years^‡, depending on the product and environmental conditions.

For optimal export protection when oil or solvent coatings are not suitable, ZERUST® recommends combining an Axxatec™ water-based inhibitor with ZERUST® VCI packaging materials such as films, bags, or emitters, along with moisture control packets for humidity control. For customized recommendations based on shipment duration, metal type, and environmental exposure, contact your local ZERUST® representative, who can design the most effective and cost-efficient corrosion prevention system for your specific export needs.

Protecting metal assets during ocean transport requires a system-based approach, especially when the goal is to protect bare steel parts during sea freight. High humidity, salt air, and temperature swings inside shipping containers create extreme corrosion risks, often causing “container rain” that rapidly accelerates rust formation. To prevent these issues, ZERUST® provides a complete corrosion-control strategy that combines corrosion preventive coatings, VCI packaging materials, and moisture-control measures to ensure metal parts arrive at their destination clean, dry, and corrosion-free.

The first step to protect bare steel parts during sea freight is to apply a temporary corrosion preventive coating. ZERUST® offers a range of oil-based, grease-based, and VCI-enhanced coatings under its Axxanol™ product line. Oil-based coatings such as Axxanol™ 33, A35-8030, and A35-30 form a thin, water-repellent film that protects machined steel parts and can be easily removed prior to assembly. For long voyages or outdoor storage, heavier grease-type coatings such as Axxanol™ Spray-G and Axxanol™ Z-Maxx provide extended barrier protection. When protection is needed in complex assemblies or enclosed spaces, VCI-enhanced oils like Axxanol™ 750 and 758 release corrosion-inhibiting vapors that migrate into hard-to-reach areas such as voids, threads, and internal chambers.

The second line of defense involves VCI packaging materials that maintain a corrosion-inhibiting atmosphere throughout transit. ZERUST® ICT® VCI films, bags, and papers should be used to fully wrap or seal parts to prevent air exchange. Incorporating ZERUST® ZDC® desiccants inside packaging helps absorb residual humidity, and ensuring a tight seal keeps in protective VCI vapors. Combining VCI packaging, desiccants, and proper sealing provides maximum protection during ocean transit.

Moisture and condensation control within the shipping container is equally critical, as “container rain” can occur from temperature fluctuations during transit. To minimize this risk, ZERUST® ZDC® desiccants or ActivDri™ PWA moisture-control packets can be used to absorb excess humidity, while ZERUST® VCI emitters such as ActivPak® or Z-PAK® add vapor corrosion protection to enclosed spaces or electrical compartments. Containers should be loaded only under dry conditions, ensuring no standing water is present before sealing.

For example, when shipping machined bare steel components by sea for four to six weeks, ZERUST® recommends cleaning and drying all parts thoroughly to remove machining fluids and residues, then applying a light coat of Axxanol™ rust preventative oil. Each part should be wrapped in ZERUST® ICT® VCI paper or sealed in a VCI bag, packed in a treated wooden crate lined with ZERUST® VCI film, and supplemented with ZDC® desiccant packs before final sealing.

By combining Axxanol™ coatings, ICT® VCI packaging, and moisture-control technologies, ZERUST® delivers a proven, system-based approach to protect bare steel parts during sea freight. This comprehensive protection strategy, supported by the ZERUST® Z-CIS® (Corrosion Inhibiting System) methodology, helps manufacturers prevent costly rust claims, rework, and shipping delays while ensuring reliable corrosion protection from origin to destination. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

To protect large fabricated parts during indoor storage, a strategic combination of environmental control, surface preparation, and protective coatings is required. Even indoor environments can promote corrosion if humidity or airborne contaminants are present. To minimize risk, maintaining relative humidity (RH) below 50% is recommended, along with stable temperatures to prevent condensation. Ensuring that metal surfaces remain above the dew point helps eliminate the formation of moisture that initiates corrosion.

Surface preparation is the next critical step to effectively protect large fabricated parts during indoor storage. Before applying any rust preventative coating, it is essential to ensure that surfaces are thoroughly cleaned and dried. Contaminants such as machining fluids, fingerprints, and mill scale should be removed using a compatible ZERUST® AxxaWash™ product, commercial alkaline, or solvent cleaner. After cleaning, parts should be rinsed, dried, and handled only with clean, dry gloves to avoid recontamination. Proper surface preparation ensures the best adhesion and performance of subsequent rust preventative coatings.

Once surfaces are clean, apply a temporary protective coating to form a physical barrier that prevents moisture and oxygen from reaching the metal surface. ZERUST® offers a comprehensive range of Axxanol™ rust preventative coatings to meet varying protection needs. Axxanol™ oil-based coatings, such as Axxanol™ 33, Axxanol™ A35-8030, and Axxanol™ A35-30, provide economical and easy-to-apply protection for up to 12 months to 3 years‡, depending on the environment. For long-term storage or when added film strength is required, Axxanol™ grease-based coatings, including Axxanol™ Spray-G and Axxanol™ Z-Maxx, offer heavy-duty protection lasting up to 3 years^‡. For applications that demand vapor corrosion protection in addition to contact protection, VCI-enhanced coatings such as Axxanol™ 750 and Axxanol™ 758 contain vapor corrosion inhibitor (VCI) molecules that migrate to protect hard-to-reach surfaces. All coatings can be easily removed before use or further processing with ZERUST® AxxaWash™ cleaning products, or with standard alkaline or solvent cleaners.

For optimal long-term indoor protection, coatings should be combined with ZERUST® ICT® VCI packaging materials. Large parts can be enclosed in ZERUST® ICT® VCI film, available in sheets, bags, or rolls, which continuously emit corrosion-inhibiting vapors to protect exposed metal surfaces. When stacking components, interleave with ZERUST® ICT® VCI paper to prevent contact corrosion. For enclosed totes, ZERUST® VCI emitters such as Vapor Capsules, ActivPak®, or Z-PAK® can be added to maintain a protective vapor corrosion inhibitor throughout the enclosure. Sealing the packaging as tightly as possible ensures that the corrosion-inhibiting atmosphere remains effective for extended durations.

By combining Axxanol™ protective coatings with ZERUST® ICT® VCI packaging technologies and proper environmental control practices, manufacturers can effectively prevent corrosion on large fabricated parts during long-term indoor storage. This integrated approach, supported by the ZERUST® Z-CIS® (Corrosion Inhibiting System) methodology, ensures reliable, cost-effective protection that maintains the integrity and readiness of stored components until they are needed for use or assembly. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Selecting the right rust preventative for heavy castings in warehouse storage is essential because large steel and cast-iron components are highly susceptible to corrosion during long idle periods. When storing heavy castings or large machinery in a warehouse for extended periods, corrosion prevention should be treated as both a process and a system. ZERUST® recommends combining Axxanol™ rust preventative coatings with proper surface preparation and VCI (Vapor Corrosion Inhibitor) packaging to ensure complete protection for up to a year or more^‡.

For these applications, the most effective rust preventative for heavy castings in warehouse storage is one formulated for long-term indoor storage capable of withstanding warehouse humidity for 6 to 12 months or longer. ZERUST® Axxanol™ A35-8030 is a proven choice for heavy castings, providing up to three years^‡ of protection in controlled indoor environments. This oil-based coating forms a thin, water-repellent barrier that shields metal surfaces from moisture and oxygen while remaining easy to remove prior to reassembly or machining. When needed, the coating can be efficiently cleaned using ZERUST® AxxaWash™ industrial cleaning products or standard commercial alkaline or solvent cleaners.

Proper application is critical to long-term performance. Before coating, surfaces should be clean, dry, and free of machining oils, rust, or debris, as contaminants can trap moisture and reduce protection. Once cleaned, apply the rust preventative by brushing, spraying, or dipping, ensuring that all exposed metal surfaces, including crevices, bolt holes, threads, and machined faces, are fully covered. For large or complex castings, ZERUST® also offers VCI-enhanced rust preventative oils, such as Axxanol™ 750 and Axxanol™ 758, which combine contact and vapor corrosion protection. These products release corrosion-inhibiting molecules that migrate to recessed or hard-to-reach areas, ensuring full coverage even where direct coating contact is limited.

In warehouse environments with variable humidity or airborne contaminants, additional packaging measures may be necessary. After applying the coating, heavy castings or machinery can be wrapped or enclosed in ZERUST® ICT® VCI film or bags to protect surfaces not coated and to maintain a corrosion-inhibiting atmosphere around the part. For particularly sensitive components or long-term storage, VCI packaging can be supplemented with ZERUST® ActivPak® or Z-PAK® emitters, and ZERUST® ActivDri™ PWA Moisture Control Packets to control residual humidity within the enclosure.

By integrating Axxanol™ rust preventative coatings, AxxaWash™ cleaning solutions, and ICT® VCI packaging technologies, ZERUST® provides a comprehensive corrosion protection system tailored for heavy castings and machinery in indoor warehouse storage. This system-based approach, supported by the ZERUST® Z-CIS® (Corrosion Inhibiting System) methodology, ensures reliable, long-term protection, minimizes rework, and maintains equipment readiness for future use or shipment. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

During seasonal shutdowns or lay-ups, it is essential to protect exposed metal surfaces from corrosion, moisture, and contamination to ensure equipment remains in optimal condition for return to service. The ideal lay-up rust preventative depends on the type of equipment, duration of shutdown, and environmental factors such as humidity, salt exposure, and temperature variation. ZERUST® offers a comprehensive range of lay-up rust preventative coatings and VCI technologies designed specifically for idle equipment and long-term lay-up protection.

For most lay-up applications, rust preventative coatings provide the first line of defense. Vapor Corrosion Inhibitor (VCI) coatings such as ZERUST® Axxanol™ 750 and 758 emit an invisible molecular layer on metal surfaces, protecting internal cavities and enclosed spaces. For external or easily accessible parts such as bearings, shafts, and machined surfaces, oil-based rust preventives, including Axxanol™ 33, 46-Bio, A35-30, and A35-8030, form a light oil film that repels moisture and provides up to several years‡ of protection depending on the environment. When equipment is stored in high-humidity or outdoor conditions, grease-based coatings like Axxanol™ Spray-G and Z-Maxx are recommended for their thicker, more durable protective barrier that can withstand extended exposure and still be removed easily prior to use.

For enclosed equipment such as control panels or electrical housings, protection can be enhanced with ZERUST® VCI emitters and desiccants. ZERUST® Vapor Capsules, ActivPak®, or Z-PAK® emit corrosion-inhibiting vapors that migrate to all internal metal surfaces, while ZERUST® ActivDri™ PWA packets provide combined moisture absorption and VCI protection to prevent condensation during idle periods.

Before applying any coating, proper surface preparation is critical for long-term effectiveness. Metal surfaces should be cleaned of dirt, oil, and existing residues, then thoroughly dried to prevent moisture entrapment. Coatings can be applied evenly using a brush, spray, or dip method, depending on the part geometry and accessibility. Prior to bringing equipment back into service, most ZERUST® rust preventative coatings can be easily removed using ZERUST® AxxaWash™ industrial cleaning solutions, commercial alkaline washes, or solvent-based cleaners.

By combining Axxanol™ lay-up rust preventative coatings, VCI emitter and moisture control technologies, and proper surface preparation, ZERUST® provides a complete corrosion protection system for seasonal lay-ups and shutdowns. This process, supported by the ZERUST® Z-CIS® (Corrosion Inhibiting System) methodology, helps extend equipment service life, minimize downtime, and ensure a smooth return to operation after long-term storage. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Selecting the right engine storage rust preventative is critical when preserving engines, gearboxes, hydraulic systems, or other enclosed lubricated equipment during long-term storage or lay-up. These systems often contain void spaces where conventional lubricating oils drain away, leaving metal surfaces exposed to condensation and humid air.

To address these challenges, ZERUST® offers two advanced solutions: Axxanol™ 707C and 710C, which are specifically engineered for protecting engines, gearboxes, hydraulic systems, and other enclosed lubricated machinery during long-term storage, shipment, or field lay-up. Both products are vapor corrosion inhibitor (VCI) oil additives that provide protection to metal surfaces inside sealed systems where conventional lubricating oils may drain away, leaving void spaces vulnerable to corrosion caused by condensation and humid air.

ZERUST® Axxanol™ 707C is a vapor-only corrosion inhibitor concentrate designed for use with compatible lubricating oils. When blended at a concentration of approximately 3–10%, it emits protective VCI molecules that migrate to exposed surfaces within the voids of engines, gearboxes, and hydraulic systems, providing up to two years^‡ of corrosion protection in closed systems. It is compatible with most engine, diesel, hydraulic, and gearbox oils (excluding PAG-based oils) and offers multimetal protection for ferrous, cast aluminum, and brass substrates.

For extended storage durations, ZERUST® Axxanol™ 710C provides enhanced, dual-action corrosion protection through both contact and vapor inhibition. It is formulated as an oil additive that protects for up to five years^‡ in closed systems by releasing VCI molecules that migrate into hard-to-reach internal. Like 707C, it is compatible with a wide range of lubricating oils and elastomers and is free from barium and heavy metals, meeting TSCA, RoHS, and REACH compliance requirements.

Both products are simple to apply; just premix the concentrate with fresh lubricating oil before filling the system. Once applied, ZERUST® recommends turning the engine or gearbox over periodically (for example, 1–2 minutes each month) to optimize inhibitor distribution. Prior to returning equipment to service, the system should be drained and refilled with fresh operational oil to ensure peak performance.

These solutions function as the ideal engine storage rust preventative for lay-ups, mothballing, or long-term preservation of critical equipment such as gearboxes, engines, and hydraulic systems. As part of the ZERUST® Z-CIS® (Corrosion Inhibiting System) methodology, ZERUST® creates a comprehensive, system-based corrosion protection program. For detailed application guidance and compatibility recommendations, refer to the product Technical Data Sheets or contact your ZERUST® representative for customized storage and protection strategies.

Long-term indoor storage of large spare parts such as shafts, bearings, rotors, gears, and housings requires a deliberate and systematic corrosion control plan. Even in indoor environments, humidity, condensation, and airborne contaminants can cause rust and surface degradation over time. ZERUST® recommends a comprehensive approach that combines surface preparation, rust preventative coatings, VCI packaging, and environmental management to effectively protect large spare parts stored indoors.

The first step is proper surface preparation, which is critical for effective corrosion prevention. All parts should be thoroughly cleaned to remove machining residues, oils, and fingerprints that can accelerate corrosion. ZERUST® AxxaWash™ industrial cleaners and degreasers are designed for this purpose, safely removing hydrocarbon soils and contaminants without leaving corrosive residues. Once cleaned, the metal surface must be completely dried to eliminate residual moisture, and any handling should be done with clean, dry gloves to avoid recontamination.

After preparation, apply a ZERUST® Axxanol™ rust preventative coating selected for the expected storage duration and environmental conditions. For short-term indoor protection (up to 1 year) in controlled conditions, a light oil film such as Axxanol™ 33 provides reliable coverage and easy removability. For medium-term storage (1–2 years), particularly in areas with moderate humidity, Axxanol™ 750-NV or 758-NV delivers excellent contact corrosion protection with a water-displacing oil film that resists humidity and oxidation. For longer-term storage (2–3 years) or areas subject to fluctuating humidity, Axxanol™ A35-8030 offers a durable oil-based barrier that provides extended corrosion protection. When storage extends beyond three years, combining a coating such as Axxanol™ A35-8030 with ZERUST® ICT® VCI film or bags ensures long-lasting, sealed protection against moisture and condensation.

Specific component types benefit from tailored protection methods. Bearings should be coated with Axxanol™ 33, wrapped in ZERUST® ICT® VCI paper, and sealed within ZERUST® ICT® VCI poly bags to trap the vapor corrosion inhibitors. Shafts and machined surfaces can be protected with the same oil-based coating and then wrapped with ICT® VCI paper and film, ensuring that all seams are sealed airtight with packaging tape.

To further protect large spare parts stored indoors, ZERUST® recommends integrating vapor corrosion inhibitor (VCI) technologies. ZERUST® ICT® films and papers emit protective vapors that form an invisible molecular barrier on metal surfaces, while ZERUST® Vapor Capsules, ActivPak®, or Z-PAK® VCI emitters provide localized vapor protection for enclosed areas such as crates, totes, or housings.

Environmental control is equally important. Even in indoor storage, maintaining relative humidity below 50%, avoiding temperature fluctuations, and ensuring adequate air circulation help prevent condensation. To actively control moisture inside sealed packaging, totes, or enclosures, ZERUST® ActivDri™ PWA Packets provide combined moisture absorption and vapor corrosion inhibition, helping stabilize the microenvironment and further reduce the risk of humidity-driven corrosion during long-term indoor storage.

Finally, all stored components should be periodically inspected, ideally every 6–12 months, to check for any signs of condensation, corrosion, or coating deterioration. Packaging integrity and seals should also be verified, and coatings reapplied as necessary to maintain protection. By following this structured approach and using AxxaWash™ cleaners, Axxanol™ rust preventatives, ICT® VCI packaging, and regular environmental monitoring, ZERUST® helps manufacturers and maintenance teams ensure that critical spare parts remain clean, dry, and corrosion-free throughout their storage period. This process-driven methodology is central to the ZERUST® Z-CIS® (Corrosion Inhibiting System) approach, which provides consistent, long-term protection and peace of mind for industrial assets. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

To protect steel components stored in an unheated warehouse, a deliberate corrosion management strategy focused on controlling moisture, temperature fluctuations, and environmental contaminants is required. Even when indoors, unheated storage areas often experience condensation cycles that can trigger corrosion. ZERUST® provides a comprehensive approach by combining environmental control, rust preventative coatings, and VCI packaging to ensure reliable protection throughout the storage period.

Whenever possible, start with environmental control measures. Improve air circulation to reduce stagnant zones where condensation can form, and store components off the floor on wooden pallets or steel racks to avoid exposure to ground moisture. However, since wood can emit acids and moisture that promote corrosion, any steel part stored on wood should first be placed in a ZERUST® ICT® VCI bag or wrapped with ZERUST® ICT® VCI paper. If humidity consistently exceeds 50%, consider placing an ActivDri™ PWA Packet inside the VCI bag with the part to control condensation.

For the metal itself, apply a ZERUST® Axxanol™ rust preventative coating appropriate for the anticipated storage duration and conditions. For short-term indoor protection, a light oil coating such as Axxanol™ 33 provides a thin, water-repellent film that resists moisture. For extended protection in environments with variable humidity, grease-based coatings like Axxanol™ Spray-G or Axxanol™ Z-Maxx offer durable, long-term barrier protection. These coatings can be easily removed later using ZERUST® AxxaWash™ industrial cleaning products or standard alkaline washes.

In addition to coatings, ZERUST® recommends incorporating Vapor Corrosion Inhibitor (VCI) packaging technologies for enhanced protection, particularly for sensitive surfaces. ZERUST® ICT® VCI paper and ICT® VCI film emit corrosion-inhibiting vapors that form an invisible molecular layer on metal surfaces, protecting against rust even in fluctuating humidity conditions. For large enclosures or packaged equipment, ZERUST® VCI emitters such as Vapor Capsules, ActivPak®, or Z-PAK® can be added to maintain a corrosion-inhibiting atmosphere throughout the space.

When packaging components, always use ZERUST® ICT® VCI film or bags instead of standard plastic wrap, which can trap moisture rather than prevent it. Sealing the VCI packaging as tightly as possible to keep VCI molecules in the packaging and prevent new moisture from entering. For long-term storage, apply a ZERUST® Axxanol™ rust preventative and then seal the component in a ZERUST® VCI bag for added protection. If the components will later undergo painting or welding, VCI-only protection is ideal, as ZERUST® VCI products leave no residue and allow parts to go directly into production without cleaning.

Periodic maintenance is essential to protect steel components in an unheated warehouse over long storage periods. Inspect stored components every one to three months for signs of condensation, corrosion, or coating deterioration, and reapply rust preventatives as needed. Keep records of inspection and re-treatment intervals to ensure consistency and traceability.

By combining Axxanol™ rust preventative coatings, ICT® VCI packaging, AxxaWash™ cleaners, and environmental control practices, ZERUST® provides a proven, system-based solution for safeguarding steel components in unheated warehouse environments. This process-driven approach, rooted in the ZERUST® Z-CIS® (Corrosion Inhibiting System) methodology, ensures long-term reliability, minimizes rework costs, and keeps stored equipment ready for use when needed. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Yes. ZERUST® offers several solutions specifically formulated to function as a dual-purpose rust preventative lubricant that both lubricates and protects metal surfaces from corrosion during idle or storage periods. These products are ideal for machinery, components, and metal parts that sit unused between operations, during shipment, or while in seasonal storage. Each formulation provides a balance of lubricity, moisture displacement, and corrosion inhibition, ensuring that parts remain ready for service without degradation or excess residue.

For general-purpose applications requiring long-term indoor protection, ZERUST® Axxanol™ A35-8030 is a long-term rust preventative oil that leaves a light, oily film offering excellent water displacement and smooth lubrication for up to three years^‡. When a cleaner, lower-residue finish is desired, Axxanol™ A35CD-32 provides a dry-to-touch coating that protects metal parts while maintaining a low-friction surface suitable for light mechanical movement or assembly. For environments demanding heavier film strength or extended idle durations, Axxanol™ Spray-G and the Axxanol™ Z-Maxx Series deliver grease-based protection that combines lubricating performance with superior barrier protection against humidity and condensation, making them ideal for equipment stored outdoors or in fluctuating conditions.

For components requiring light electrical lubrication and corrosion resistance, ZERUST® Axxanol™ 718-ESS offers a multimetal electrical corrosion inhibitor spray that provides both contact lubrication and rust protection for connectors, switches, and exposed electronic components.

Most Axxanol™ products can be paired with ZERUST® ICT® VCI packaging for enhanced protection of stored or shipped assemblies. By using a dual-purpose rust preventative lubricant in one step, ZERUST® Axxanol™ products help reduce maintenance time, minimize rework, and ensure that idle machinery or parts remain clean, rust-free, and immediately ready for use. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Protecting electrical or control-panel enclosures from corrosion requires controlling moisture and airborne contaminants inside the enclosure while using corrosion-inhibiting products that are safe for sensitive electrical components. ZERUST® offers a full portfolio of corrosion solutions specifically engineered for electronics and electrical enclosures, ensuring that protection does not interfere with conductivity, insulation, or mechanical function. The key is to use non-conductive, non-hardening, thin-film or vapor corrosion inhibitors that do not alter electrical performance or require removal before normal operation. ZERUST® Axxanol™ 718-ESS is ideal in these environments: it leaves a thin, water-displacing, non-staining, non-hardening protective film that lubricates and shields terminals, connectors, bus bars, junction boxes, and cabinet interiors without impacting electrical resistance or operation. For vapor corrosion protection inside sealed enclosures, ZERUST® VCI diffusers and emitters, including Vapor Capsules, ZAK-M22 Capsules, ActivDri™ moisture-control packets, ICT® Plastabs®, ActivTab™(LS) tablets, ActivCapsule™ FAC1-1(S), and Cor Tab® tablets emit corrosion-inhibiting molecules that migrate throughout the enclosure, protecting metal surfaces in hard-to-reach areas without coating components. These products are safe for use around metals, plastics, elastomers, and painted surfaces commonly found inside electrical equipment.

When applying ZERUST® corrosion preventatives inside an enclosure, the best practice is to clean and dry all metal surfaces first to remove dust, oxidation, and contaminants, then apply only a thin, even film of Axxanol™ 718-ESS to exposed metal surfaces while avoiding excessive buildup near sensitive parts. VCI emitters should be mounted or placed inside the enclosure according to ZERUST® installation guidance so that vapor molecules can freely circulate. Ensure the protective film does not obstruct airflow, cooling paths, or moving components. After treatment, the enclosure can be restored to service, with follow-up inspections scheduled every 6–12 months, especially in harsh environments such as coastal areas, chemical plants, or facilities with high humidity. For best results, users can integrate these products into a strategic corrosion prevention strategy, which includes proper environmental control, correct packaging practices, and routine maintenance.

By combining Axxanol™ 718-ESS for direct metal protection with ZERUST® VCI capsules, sachets, tablets, and emitters, companies can protect electrical enclosures from corrosion without affecting electrical performance, ensuring long-term reliability, reduced downtime, and extended equipment life. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Yes. ZERUST® provides several non-staining rust preventatives for aluminum and copper, engineered to protect multimetal assemblies and other non-ferrous alloys, as well as steel, without causing discoloration, tarnish, or surface spotting. When working with multimetal parts or components containing aluminum or copper, it is important to choose a corrosion preventative that produces a clear, non-staining film, is compatible with the alloy, and will not alter surface appearance or interfere with subsequent operations such as assembly or finishing. Several ZERUST® products are designed for this purpose. For example, ZERUST® Axxatec™ 48C is a water-based, non-staining corrosion inhibitor engineered for aluminum and yellow metals while also protecting ferrous substrates; it dries to a safe, clear film ideal for storage and shipment. In addition, ZERUST® Axxatec™ DA-40AL provides dual-action cleaning and corrosion protection for aluminum and other multimetal parts, making it suitable when both surface preparation and short-term protection are required. Lastly, ZERUST® Axxatec™ 80C offers a clear, non-staining coating designed for aluminum, ferrous metals, and yellow metals, making it an excellent choice for components requiring a clean, residue-free appearance during storage, processing, or shipment.

Many ZERUST® Axxanol™ rust preventatives, including Axxanol™ A35CD-32, a dry-to-touch, clear film RP, and Axxanol™ 718-ESS, a thin, water-displacing, non-hardening electrical corrosion inhibitor, also provide protection without leaving heavy, oily, or dark residues that can stain copper or aluminum surfaces. These products are designed to be non-staining and easy to clean, making them suitable for multimetal parts and precision-machined components that require pristine surface appearance.

Like all corrosion preventatives, compatibility should still be verified for the specific alloy and finish being protected, as appearance can vary between different types of aluminum, copper, and surface treatments. ZERUST® best practice includes testing the product on a small, non-visible area first, ensuring the film leaves no haze or discoloration under your actual storage or process conditions. For applications where you want zero surface residue, ZERUST® also offers VCI (Vapor Corrosion Inhibitor) packaging solutions, such as ICT® VCI film, ICT® VCI paper, and VCI emitters (Vapor Capsules, ActivPak®, Z-PAK®) that protect both ferrous and non-ferrous metals without touching the metal surface at all. Since VCI protection is molecular and leaves no coating behind, it is ideal for aluminum or copper parts that must remain clean, bright, and immediately ready for welding, soldering, painting, or assembly.

By selecting the appropriate non-staining rust preventatives for aluminum and copper, whether Axxatec™ or Axxanol™ corrosion inhibitor, or by using residue-free VCI packaging, ZERUST® provides reliable, appearance-safe protection for aluminum, copper, brass, and multimetal components during processing, storage, or shipment. This selection and validation process is part of the ZERUST® Z-CIS® (Corrosion Inhibiting System) methodology, ensuring each application receives the correct product, application method, and protection level based on alloy type, environmental conditions, and required storage duration. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

To prevent rust on spare parts in long-term storage, you need a coordinated approach that combines environmental control, proper surface preparation, protective coatings, and ZERUST® VCI packaging technologies. Even in indoor warehouses, fluctuations in humidity and temperature can cause condensation and lead to corrosion over time. To minimize this risk, maintain the storage environment at a stable temperature with relative humidity ideally under 50%, using dehumidifiers or localized climate control when necessary.

The next line of defense to prevent rust on spare parts in long-term storage is applying ZERUST® VCI (Vapor Corrosion Inhibitor) packaging, which provides clean, residue-free corrosion protection for a wide range of metals. Spare parts can be wrapped or sealed in ZERUST® ICT® VCI film, bags, or paper, which release corrosion-inhibiting molecules that form an invisible protective layer on metal surfaces inside the packaging. For additional moisture control in sealed containers or totes, ZERUST® ActivDri™ PWA moisture-control packets or ZERUST® ZDC® desiccants can be added to absorb residual humidity. For long-term preservation, especially for critical or expensive components, pairing VCI packaging with ZERUST® VCI emitters (such as Vapor Capsules, ActivPak®, or Z-PAK®) provides enhanced protection in enclosed or hard-to-reach areas.

For parts where packaging alone is not sufficient, apply a ZERUST® Axxanol™ rust preventative coating based on the storage duration and type of metal. Light oil-based protectives like Axxanol™ 33 are suitable for indoor storage up to 1 year^‡, while Axxanol™ 750-NV, 758-NV, and A35-8030 offer stronger barrier protection for up to 2 to 3 years^‡ of storage. For severe environments or heavy-duty storage, grease-based coatings such as Axxanol™ Spray-G or Axxanol™ Z-Maxx provide extended protection against humidity and condensation. When easier handling and cleaner surfaces are required, dry-to-touch inhibitors such as Axxanol™ 33CD, 34CD, A35CD-32, or A35CD-7 provide corrosion protection without leaving an oily residue.

Before applying any protective coating or packaging, all parts should be properly cleaned and dried to remove dirt, fingerprints, coolant residues, machining oils, and moisture. ZERUST® AxxaWash™ industrial cleaners and degreasers are ideal for preparing the surface, and protection should be applied immediately after cleaning to prevent flash rust, if an AxxaWash™ industrial cleaner without rust inhibitors is used. In storage, if metal surfaces must rest on pallets, use ZERUST® VCI Film as a barrier between the metal surface and pallet to prevent moisture transfer from the wood.

Finally, implement a routine inspection schedule. Spare parts in storage should be evaluated every 3–6 months for signs of condensation, emerging rust spots, or packaging damage. Reapply coatings or replace VCI packaging as needed, and follow FIFO (First-In, First-Out) practices to minimize the time parts remain in storage.

By combining Axxanol™ coatings, AxxaWash™ surface preparation, ICT® VCI packaging, ActivDri™ moisture control, and regular maintenance under the ZERUST® Z-CIS® (Corrosion Inhibiting System) methodology, maintenance warehouses can ensure spare parts remain clean, rust-free, and ready for use, even during long-term storage. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Hand tools, cutting tools, and dies are typically made of steel or other ferrous alloys and can rust quickly when exposed to humidity, condensation, or fingerprints. While oil-based rust preventatives are effective, they can make hand tools messy, slippery, and unpleasant to handle, especially when tools are used frequently. For this reason, ZERUST® strongly recommends vapor corrosion inhibitor (VCI) technology to protect hand tools from rust. The most effective and clean solution is to place ZERUST® Vapor Capsules inside toolboxes, drawers, or storage cabinets, or to use ZERUST® Toolbox Drawer Liners, which continuously release safe vapor corrosion inhibitors that protect all metal surfaces inside the enclosed space. These products provide excellent rust protection without leaving any oily residue, ensuring tools stay clean, dry, and ready for immediate use.

For dies, precision tools, and metal components that are stored for longer periods between uses, ZERUST® recommends applying Axxanol™ rust preventative coatings for direct surface protection. Light oil-based inhibitors such as Axxanol™ 33, Axxanol™ 750-NV, and Axxanol™ 758-NV provide a thin, moisture-displacing film that protects metal surfaces while remaining easy to remove when needed. When a dry-to-touch finish is required, products such as Axxanol™ A35CD-7, Axxanol™ A35CD-32, and Axxanol™ 33CD offer dry-to-touch films that resist humidity and are ideal for precision dies and machined surfaces. For severe humidity or extended lay-up, heavier coatings like Axxanol™ Spray-G or Axxanol™ Z-Maxx deliver long-lasting barrier protection. Additionally, pairing any Axxanol™ coating with ZERUST® ICT® VCI film or ICT® VCI paper provides dual-layer protection through both direct contact and vapor-phase corrosion inhibition, providing an excellent solution for large dies or parts stored in variable or unheated environments.

Regardless of the method, proper preparation is essential to protect hand tools from rust and extend coating longevity. Tools and dies should be thoroughly cleaned and dried prior to protection, ideally using ZERUST® AxxaWash™ cleaners to remove oils, residues, and contaminants that promote corrosion. Apply coatings in thin, even layers, remove excess to avoid dust accumulation, and store assets in a dry environment when possible. For frequently used tools, replace VCI capsules as recommended; for dies, inspect every few months to ensure the protective film remains intact.

By combining clean, residue-free VCI protection for hand tools with Axxanol™ rust preventative coatings for dies, along with ZERUST® cleaning and packaging solutions, users can ensure that tools and dies remain clean, dry, and rust-free between uses, supporting longer service life and reliable performance under the ZERUST® Z-CIS® (Corrosion Inhibiting System) approach. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Protecting metal parts in high-humidity or coastal environments requires a coordinated, system-based approach because moisture, salt, and airborne contaminants dramatically accelerate corrosion. To protect metal parts in high humidity and coastal environments, ZERUST® recommends combining surface protection, environmental control, and VCI (Vapor Corrosion Inhibitor) packaging as part of its Z-CIS® (Corrosion Inhibiting System) methodology.

Start by ensuring that all parts are clean and free of salts, fingerprints, and residues using ZERUST® AxxaWash™ industrial cleaners, which remove corrosive contaminants without leaving behind harmful films. After cleaning, apply a ZERUST® Axxanol™ rust preventative coating selected for the storage duration and severity of the environment. Light- to medium-duty oils such as Axxanol™ 33, 750-NV, 758-NV, 46-BIO, A35-30, or A35-8030 provide excellent barrier protection against humidity. For prolonged or extreme environmental exposure, especially outdoors, heavy-duty coatings such as Axxanol™ Spray-G or Axxanol™ Z-Maxx offer long-term protection and moisture resistance.

Next, ZERUST® recommends placing metal parts inside sealed VCI packaging, which protects any areas that the applied coatings cannot easily reach. ZERUST® ICT® VCI films, bags, and shrink films release corrosion-inhibiting molecules that form a protective molecular layer on exposed metal surfaces. Interleave stacked parts with ZERUST® ICT® VCI Paper, and for extremely harsh environments or during outdoor storage, use ZERUST® ICT®510-OPS Outdoor Preservation VCI Film, which is specifically engineered for outdoor conditions. Adding ZERUST® ActivDri™ PWA Moisture-Control Packets inside sealed applications stabilizes the microenvironment by absorbing moisture while simultaneously providing VCI protection. For crates, totes, or large enclosures, ZERUST® VCI emitters such as Vapor Capsules, ActivPak®, or Z-PAK® further extend protection into enclosed volumes.

Environmental management is essential when trying to protect metal parts in high-humidity and coastal environments. Whenever possible, maintain storage areas at less than 50% relative humidity and ensure steady airflow to minimize condensation cycles. If parts are to be stored on pallets, avoid direct metal-to-wood contact unless a ZERUST® VCI film or paper is placed between them as a barrier layer, since wood can emit acids and moisture that accelerate corrosion. In coastal plants where salt fog is present, periodic rinsing with AxxaWash™ cleaners followed by reapplication of the protective coating helps remove salt deposits that accumulate on exposed surfaces.

Finally, implement a regular inspection and maintenance schedule. Stored parts should be checked every three to six months for signs of condensation, packaging damage, or coating degradation. Reapply coatings and replace VCI packaging as needed to ensure continuous protection. By combining AxxaWash™ cleaning, Axxanol™ rust preventatives, ICT® VCI packaging, ActivDri™ moisture control, and proper environmental management, ZERUST® provides a robust and scalable solution for protecting metal parts stored in even the most demanding coastal or high-humidity environments. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Yes. ZERUST® offers a range of products formulated to provide both rust prevention and light lubrication in the field, making them ideal for situations where equipment must stay protected and functional during outdoor use, service work, or temporary idle periods. Several oil and solvent coatings in the Axxanol™ portfolio are specifically engineered to offer a balance of moisture displacement, corrosion protection, and light lubricity for metal parts, tools, and equipment exposed to outdoor or variable conditions. For example, Axxanol™ A35-8030 delivers long-term rust protection while providing a smooth, lubricating oil film suitable for hinges, pins, exposed metal surfaces, and general field maintenance. When a cleaner, near-dry film is preferred, Axxanol™ A35CD-32 or Axxanol™ 718-ESS offer solvent-based, water-displacing formulations that provide corrosion protection without leaving heavy oily residues, ideal for parts that need to remain clean or for light electrical/mechanical contact lubrication. For harsher outdoor exposure or long idle periods, grease-based dual-function products like Axxanol™ Spray-G and Axxanol™ Z-Maxx provide lubricity with a thicker, more durable barrier film that resists high humidity.

While using a single product offers clear advantages, reduced inventory, and simpler field maintenance, it is important to understand limitations. Dual-purpose oils are not a substitute for heavy-duty lubricants required for high-load gears, bearings, or long-term friction points, and thin films may require more frequent reapplication in rain, salt-rich atmospheres, or high-humidity coastal environments. Similarly, some products can attract dust in sandy or dirty conditions if overapplied. For best results, ZERUST® recommends using light, multi-purpose Axxanol™ oils for active field maintenance and switching to more robust coatings, such as Axxanol™ Z-Maxx, Axxanol™ Spray-G, or pairing coatings with ZERUST® ICT® VCI packaging when equipment will be stored for extended periods or exposed to severe corrosion environments.

By selecting the appropriate Axxanol™ rust preventative/lubricant and following ZERUST® best practices, such as cleaning surfaces first, applying thin, even films, and wiping off excess oil, users can effectively maintain rust prevention and light lubrication in the field while ensuring smooth operation during maintenance activities. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

Protecting large equipment and metal assets stored outdoors or in extreme environments requires a robust outdoor equipment corrosion protection system that shields against rain, UV exposure, temperature swings, and airborne contaminants. ZERUST® addresses these challenges with a combined approach using UV-resistant VCI shrink films, long-term rust preventative coatings, and moisture-control technologies. A cornerstone of this approach is ZERUST® ICT®510-OPS Outdoor Preservation VCI Shrink Film, an 8-mil, high-strength shrink film that integrates VCI technology with UV stabilizers for long-term outdoor preservation. When heated, ICT®510-OPS conforms tightly around equipment, vehicles, and large components, creating a durable barrier that repels moisture and contaminants while saturating the enclosed space with VCI molecules. This protects both exposed and hard-to-reach internal surfaces, providing proven corrosion and UV protection for extended outdoor storage. For seams and edges, ZERUST® OPS Preservation Tape can be used to seal overlaps and critical areas, ensuring an enclosed, corrosion-inhibiting environment.

For direct contact protection, ZERUST® recommends pairing ICT®510-OPS with long-term rust preventative coatings from the Axxanol™ and AxxaCoat™ portfolios. Axxanol™ Spray-G and the Axxanol™ Z-Maxx Series are sprayable and brushable rust preventative greases specifically suited for long-term outdoor storage, forming robust barrier films on exposed steel, cast iron, and other ferrous surfaces. For demanding outdoor applications, AxxaCoat™ 90B HFS offers a high-flash, corrosion-inhibiting coating designed to replace traditional hot-melt or heavy wax systems with a safer, easier-to-apply alternative. These coatings can be applied to critical surfaces such as flanges, fasteners, weld areas, and machined faces before the asset is wrapped, ensuring both contact and vapor-phase protection. In highly aggressive or coastal environments, ZERUST® recommends supplementing shrink film and coatings with ActivPak® or Z-PAK® VCI emitters to boost vapor-phase corrosion protection in voids and complex geometries, and adding ActivDri™ PWA moisture-control packets inside the enclosure to actively manage residual humidity.

A successful outdoor preservation program also depends on proper surface preparation and installation. Before coating or wrapping, surfaces should be cleaned and dried using ZERUST® AxxaWash™ industrial cleaners to remove salt, dirt, oils, and other contaminants that accelerate corrosion. After cleaning, apply the selected Axxanol™ or AxxaCoat™ product per ZERUST® guidance, allow any coatings to dry/cure as required, and then wrap the asset with ICT®510-OPS, shrinking and sealing the film to create a tight, weather-resistant envelope. For long-term lay-up or mothballing, periodic visual inspections of the film, seams, and any exposed surfaces are recommended, with patching or supplemental treatment as needed.

By combining ICT®510-OPS Outdoor Preservation VCI Shrink Film, Axxanol™ and AxxaCoat™ rust preventative coatings, ActivPak®/ActivDri™ moisture-control technologies, and proper surface preparation, ZERUST® delivers a comprehensive outdoor equipment corrosion protection system for large equipment and metal assets exposed to harsh or extreme environments. This integrated approach helps reduce corrosion-related rework, preserves asset value, and ensures equipment is in ready-to-use condition when removed from storage. For guidance on selecting the best solution for your needs, you can contact ZERUST®/EXCOR® to speak with a technical service representative.

ZERUST®, a division of Northern Technologies International Corporation (NTIC), invented Vapor Corrosion Inhibitor (VCI) poly packaging. In 1979, NTIC became the first company to develop and patent polyethylene film with vapor corrosion inhibitor (VCI) technology. This breakthrough created the world’s first VCI poly packaging.

Before this invention, companies protected metal parts with oils, greases, and heavy coatings. ZERUST® changed that. By adding safe VCI molecules directly into polyethylene film, ZERUST® made it possible to protect metal parts during storage and shipment without messy coatings or extra steps. This innovation created an entirely new category of corrosion protection.

For more than five decades, ZERUST®/NTIC has continued to improve VCI polymer technology through active R&D, global laboratory teams, and real-world customer testing. Today, ZERUST® remains the original inventor and global leader in VCI poly packaging, supplying high-performance films, papers, diffusers, and corrosion-management systems to customers in more than 70 countries.

For help choosing the right VCI packaging, contact ZERUST®/EXCOR® to speak with a technical service representative.

Most ZERUST®/EXCOR® VCI film products have a shelf life of up to three years when the product is stored in original airtight packaging, out of direct sunlight, and under shelter. Other products such as VCI Kraft paper, VCI emitters, liquids, and rust removers may have a shorter shelf life. Please refer to each product’s infosheet for the correct shelf life.

ZERUST®/EXCOR® VCI provides effective corrosion protection for clean metals for years^‡ when used correctly and utilized within three (3) years from receipt. ZERUST®/EXCOR® VCI products should be stored in original packaging away from direct sunlight in conditions below 85°F (30°C) and 50% RH until it is ready for use.

The component/part or volume needing protection must be completely enclosed by a ZERUST®/EXCOR® active material (VCI Poly/VCI Paper). If complete ZERUST®/EXCOR® packaging is being used, no additional VCI material is required. However, this also depends on the nature of the packed merchandise. If there are difficult-to-access areas, it is advisable to use additional ZERUST®/EXCOR® VCI Emitters and Diffusers to add additional protection.

ZERUST®/EXCOR® VCI film and bags can be reused if they are dry, clean, and undamaged. Small holes in the VCI film material can be sealed with adhesive tape. VCI bags that have large holes or tears or have begun to crack or lose strength due to excessive exposure to direct sunlight will not provide adequate corrosion protection and should not be reused.

The more tightly sealed the VCI packaging, the better the volatile corrosion protection. Seals may be closed with zip-ties, packaging tape, or staples. A good closure method is to fold over the film and either tape or staple the area shut. When stapling, seal over the holes made by the staples with tape. The best seal is always a heat seal, but it is not necessary. Also, it is unnecessary to extract air from the enclosure before sealing to prevent future airflow. Water must be prevented from penetrating the packaging. Be careful to fold over the film and close VCI gusset bags so water cannot easily pool and enter the enclosure.

Use a high-quality packaging tape that is designed to adhere to low-energy surfaces like polyethylene or, you can fold over and staple the area shut and then seal over the holes made by the staples with the recommended tape. If you have a large rip that you cannot close easily with tape or staples, you should replace the bag with a new one. The best seal is always a heat seal.

After removal of ZERUST®/EXCOR® packaging, the VCI substances present on the metal surface disperse within one to two hours.

Both VCI packaging products are useful, but one may be a better option depending on the application. VCI paper releases VCIs more rapidly than VCI film, but does not have as long of a service life. VCI film acts as a barrier to water vapor, whereas dry paper readily absorbs moisture. Other characteristics of the product needed could include formability, visibility of parts, and outer packaging used. The application should be oriented toward the goods to be protected and the details of the manufacturer’s packaging operations. A ZERUST®/EXCOR® representative can advise you on this.

A light oil coating on the metal part is fine to use with ZERUST®/EXCOR® VCI bags and film. A heavy oil coating may affect the performance of the VCI bag by keeping the vapor corrosion inhibiting molecules from reaching the metal surface. Please contact ZERUST®/EXCOR® to determine the suitability of the oil and application.

Ferrous: Iron, steel, and cast iron metals are protected using ZERUST®/EXCOR® Ferrous Packaging.
Non-Ferrous: Aluminum (and aluminum alloys containing copper and/or manganese), copper, brass, bronze, and fully galvanized steel are protected using ZERUST®/EXCOR® Non-Ferrous Packaging.
Multimetal: Products that contain combinations of the Ferrous and Non-Ferrous metals listed above can be protected by ZERUST®/EXCOR® Multimetal Packaging.
Silver: Is protected from tarnishing with ZERUST®/EXCOR® anti-tarnish packaging or film with acid-gas scavenger additives.

ZERUST®/EXCOR® trademark color is yellow for VCI film. We also offer stock items in blue, green, clear, and gray. We can custom produce most products in any color of your choice.

If you have any questions regarding the best VCI protection for your needs, we advise consulting a ZERUST®/EXCOR® representative. ZERUST®/EXCOR® possesses wide-ranging testing capabilities, which quickly enable us to determine the optimum method of protecting a given metal item. We also can send samples for customers to conduct their own tests. First, try packing identical parts simultaneously and under identical conditions, one part in a normal film or your current packaging and one in ZERUST®/EXCOR® film. Next, store these parts for several days in the most challenging conditions they will be in, such as high humidity, or move them from warm to cool places in your warehouse, similar to shipping conditions. If the part packed in normal packaging shows signs of corrosion, while the one packed in ZERUST®/EXCOR® VCI film shows none, it can be assumed that the part requires VCI protection.

Each order is tested by ZERUST’s Quality Control Department to ensure that it meets our quality standards for corrosion protection and material performance. Part of the quoted lead time is used for this quality testing. If you’d like to waive this quality testing on your product, you must sign a Quality Testing Waiver Request form. Please contact your service representative for more information.

Yes, Northern Technologies International Corporation, the maker of ZERUST®/EXCOR® products, operates a quality management system for the design and manufacture of corrosion inhibiting and protective packaging systems that are certified to conform to the ISO 9001:2015 Quality Management Standard.

Yes. ZERUST®/EXCOR® VCI films made of polyethylene and polypropylene can be recycled at facilities for PE/PP processing or incinerated. To further promote sustainability, ZERUST® has partnered with RecycleMax® to launch ZeCycle, a closed-loop recycling program that enables businesses to recycle used ZERUST® VCI packaging into new post-consumer recycled (PCR) VCI film. By participating in ZeCycle, companies can reduce plastic waste, lower their carbon footprint, and actively support a circular economy.

Yes. ZERUST®/EXCOR® offers both virgin and recycled material options to meet diverse customer needs. While traditional ZERUST®/EXCOR® VCI packaging products are produced using high-quality virgin materials for consistency and performance, we also provide sustainable alternatives. Our ZERUST® ICT®510-PCR30 Post-Consumer Recycled (PCR) VCI Film incorporates 30% post-consumer recycled polyethylene, reducing the demand for virgin plastics while maintaining the same trusted corrosion protection. Additionally, several other ZERUST® products—including ICT®510-C, ICT®510C-AN, ICT®510-OPS, ICT®510-SM, ICT®510-SRK, ICT®520-CB1, ICT®520-FD, and ICT®520-HS—are now manufactured with at least 10% recycled plastic content. Through our ZeCycle Recycling Program, businesses can recycle used ZERUST® VCI packaging, contributing to a circular economy and supporting environmental compliance initiatives.

To purchase ZERUST® VCI products, you can either call 1-800-328-2433 or 1-763-225-6600 to speak with a customer service representative or send an email to nticssales@ntic.com.

For flat bag, sheet, sleeve, and round bottom bags.

You may also try our bag calculator to help find the right sized back for you.

NTIC’s stock products ship from centrally located warehouses in the United States. In stock products ship within 1-2 days. Some stock liquid and powders require 5-7 days for repacking certain sizes. Your customer service representative can advise you of your products handling time and estimated shipping time.

NTIC’s custom product lead times vary depending on the product and quantity. Typical lead times for custom products are 3-4 weeks. Some specialty product features or additives can take 8-10 weeks. For specific product inquiries, please contact our customer service team.