Definition & Core Working Principle
The full name of rust-proof film is VCI vapor corrosion inhibiting plastic film. It is a functional industrial packaging film made by adding vapor corrosion inhibitor (VCI) to PE base material, providing dual rust protection through physical isolation + vapor chemical protection:
Physical barrier:
The plastic film isolates corrosive media such as external water vapor, oxygen, salt and acid rain;
Vapor rust prevention (core function):
In a sealed space, the VCI inside the film volatilizes slowly. The gas penetrates all gaps and blind spots of metal, forming an invisible monomolecular protective film on the metal surface to block metal electrochemical corrosion and fundamentally prevent rust.
Main Classifications & Features
Classified by applicable metals
For iron (yellow film): Carbon steel, cast iron, steel materials and stamped parts;
Universal for multiple metals: Steel, copper, aluminum, zinc, electroplated parts and alloys;
Special for non-ferrous metals: Copper, aluminum and brass, preventing discoloration and corrosion caused by corrosion inhibitors.
Classified by functional forms
Ordinary PE VCI rust-proof film (most widely used) Made of LDPE, soft, heat-sealable and cost-effective; thickness 0.05~0.2mm, with a rust protection period of 2 to 5 years, suitable for regular storage and sea transportation of parts and steel products.
VCI heat shrink film It shrinks tightly against workpieces when heated, used for sealed packaging of large motors and complete equipment.
Anti-static VCI rust-proof film Added with anti-static masterbatch, specially for precision electronic hardware and chip connectors, providing both anti-rust and anti-static functions.
Core Advantages (Compared with anti-rust oil and VCI paper)
No cleaning & no residue
Parts can be directly assembled after unpacking, no degreasing required, greatly saving working procedures;
Omni-directional dead-angle protection
The vapor can penetrate deep holes, slits and complex special-shaped parts;
Eco-friendly & safe
Eco-friendly & safe: Most types are nitrite-free and RoHS compliant, harmless to human bodies and workpieces;
Visual inspection available
Transparent versions allow direct observation of internal parts without unpacking;
Flexible processing
Can be made into roll films, flat bags, ziplock bags, three-dimensional covers and tube films;
Long-term protection
2 to 5 years for indoor sealed storage, several years for aluminum foil composite versions;
Applicable Industries & Products
Machining industry: Bearings, gears, shafts, flanges, valves and molds;
Automobile & new energy industry: Engine accessories, chassis parts, motor iron cores and battery metal shells;
Hardware tools: Cutting tools, measuring tools, standard fasteners and stamped parts;
Metallurgy industry: Steel plates, steel pipes, aluminum profiles and copper strips;
Precision electronics: Connectors, copper contacts, sensors and metal parts of circuit boards;
Large-scale equipment: Wind power parts, construction machinery, ship accessories and machine tools;
Export sea freight: Packaging for overseas shipments in coastal high-humidity and salt spray environments.
Standard Operation Instructions
Workpiece pre-treatment
Workpieces must be dry, water-free, oil-free and rust-free, and cooled to room temperature before packaging. Avoid direct contact with sweat; wear clean cotton gloves during operation.
01
Packaging clearance
Keep a 10~30cm gap between the rust-proof film and metal; do not place acidic wood or chlorine-containing paper inside the package.
02
Sealing is critical
Fully seal all openings with heat sealing, adhesive tape or ties. Air leakage will cause VCI to volatilize and lose efficacy. For large workpieces, match with VCI powder or VCI paper for enhanced protection.
03
Vapor forming time
It takes about 30 minutes to fill small packages (<25L) with anti-rust gas; about 3 hours for 1 cubic meter space.
04
Precautions for incompatible materials
Use cautiously for magnesium alloys; avoid storing together with strong acids, strong alkalis and sulfur-containing materials.
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General Specifications Reference
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Repair broken packaging immediately, otherwise the anti-rust service life will be greatly shortened;
For humid sea transportation, use desiccants together for double-layer protection;
Do not use mismatched film types for different metals to avoid discoloration and corrosion;
Use opened rolls as soon as possible; long-term open placement will consume internal VCI corrosion inhibitors.