This protection works best when parts are:
- Clean and free of corrosive residues
- Surface dry with no visible water
- Enclosed in properly sealed VCI packaging
VCI protection begins quickly after enclosure, but it is not a substitute for drying or cleaning steps.
Why surfaces should be dry before VCI packaging
Moisture left on parts can become trapped inside the package. If water remains in direct contact with the metal, corrosion may start before the VCI layer fully establishes itself. Since VCI products do not displace moisture, it’s best to keep surfaces dry.
For best results:
- Remove standing water after washing or rinsing
- Allow parts to reach surface dry condition
- Avoid sealing hot parts that may later condense moisture
Following these steps allows VCI molecules to work as intended and deliver reliable corrosion protection, since VCI products do not actually displace moisture.
Common misconceptions about VCI products displacing moisture
One common misunderstanding is that VCI behaves like a desiccant or moisture displacer, so we are commonly asked, “Do VCI products displace moisture?” It does not. VCI technology prevents corrosion by chemistry, not by drying the environment.
In applications involving high humidity, washed parts, or temperature swings, ZERUST® often recommends combining VCI packaging with proper drying practices and, when needed, desiccants or rust preventative fluids.
Do VCI products displace moisture or require additional moisture control
If parts are packaged while damp, exposed to humid environments, or shipped long distances, additional measures may be necessary. These can include:
- Improved drying or rinse water control
- Use of desiccants inside the package
- Applying compatible rust preventative coatings before VCI packaging
Working with ZERUST® corrosion experts helps ensure the right combination of technologies is used for each application.
