Zinc Layer Turning Black Under Blue Film? Yes, It‘s Corrosion — Switch to Guangdayuan’s Neutral-pH PE Blue Film

author: Shenzhen Guangda Yuan Film Co., Ltd.
2026-06-02
PET Protective Film

Product Characteristic

Blackening of galvanized zinc layers under PE blue protective film within days is definitely caused by film-induced corrosion. Ordinary blue films contain acidic additives or corrosive colorants that react with zinc. Guangdayuan‘s neutral-pH PE blue protective film uses acid-free, non-corrosive masterbatch and adhesive systems. Developed with premium raw materials from Toray and Toyobo, our film passes neutral salt spray testing (ASTM B117) with zero blackening.

Full Specification Parameters

Thickness range: 40μm to 120μm. Width: up to 1800mm. pH of water extract: 6.5-7.5 (neutral). Corrosion test: no blackening after 72 hours neutral salt spray. Adhesion: customizable from 10g/in to 400g/in. The film passes ISO9001 and ISO14001 certification.

Product Protection Purpose & Article Summary

This neutral-pH PE blue film is specifically designed for galvanized steel sheets, zinc-plated parts, and metal stampings in construction, automotive, and appliance industries. Its primary purpose is preventing corrosion blackening while protecting surfaces during storage and transport.

Blackening equals corrosion. Guangdayuan‘s neutral-pH PE blue film stops it. Backed by 20 years of expertise and a 16,000㎡ facility, we offer free sample testing. Contact us at 0755-28171981 or 18928456898 for corrosion-free protection.

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