It is a gas containing corrosion inhibitor polyolefins resin as basic material of thin film, volatile, in enclosed environment through an invisible, efficient to protect metal vapor phase anti-rust molecules attached to the surface and the corner of the metal objects, moisture, salt, oxygen and other may cause material corrosion material can't direct contact with the metal surface reaction, thus preventing metal rust.Easy to use, safe and efficient for long-term inventory, export shipment, assembly of process and many other applications have good effect.