What Is VCI Paper and How Does It Prevent Corrosion?
VCI paper is kraft or specialty paper carrying volatile corrosion inhibitors that protect metal inside a closed package. The inhibitor vapor travels through the enclosed air space and forms a temporary molecular layer on exposed metal, including recesses and threads. When the package opens, the vapor dissipates and the part can move directly to inspection or assembly without removing heavy rust preventive oil.
VCI performance depends on correct use. Parts must be clean and dry; the paper must cover enough surface area; the outer carton, bag or crate liner must limit free airflow; and the chemistry must match the metals. Paper handles interleave and wrap. VCI film handles sealed bags and larger enclosures. Desiccants manage free moisture in container air. Strong export packs often use all three for different jobs.
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