Classified by the U. S. Dept. of Defense as Class 3, Style A, (Light duty) kraft packaging paper with corrosion inhibitors for protecting ferrous metals. Nox-Rust Vapor Wrapper 4060 is listed on the DOD Qualified Products Database for MIL-PRF-3420H. VCI rust inhibitor paper protects metal parts and spares used in military and government applications. Highest level of VCI protection, for long-term storage. Paper is printed per the military specification.