... paper series are a new type packaging material, preventing metal products from corrosion. Model: SF/T501- (PO, PA, WA ... automobile and motor-bicycle fitting, etc.Metals protected:Copper and its alloy, Copper belt, memorial currency, currency, multimetal steel,etc ... used for the packaging material of corrosion protection of copper products in non-ferrous metal smelting, military industry, machinery and ...