... absorption of desiccant.3. VCI Principle:VCI(Volatile Corrosion Inhibitor),is a kind of corrosion inhibitorcomposited by special ingredient. At normal temperature ... from water and oxygen and inhibit electrochemical reaction of metal corrosion, then attain the antirust purpose.4. Usage method :Generally , 40 ... is white powder.7. Period of validity: one year Rust corrosion inhibitor powder