Prepainted Galvalume Iron Coils

PVDF Resin Chemistry
Architectural-grade pre-painted coils utilize 70% PVDF resin (polyvinylidene fluoride) blended with 30% acrylic modifiers, creating fluoropolymer matrices with unparalleled weatherability. Kynar 500®/Hylar 5000® resins provide UV-stable C-F bonds (bond energy 485 kJ/mol vs C-H’s 413 kJ/mol), while acrylics enhance pigment dispersion and adhesion. The formulation incorporates UV absorbers (benzotriazoles) and HALS stabilizers that quench free radicals, maintaining >95% gloss retention after 10 years Florida exposure. Pigment loading is capped at 40% volume concentration to ensure complete resin encapsulation, with inorganic chromates (e.g., mixed metal oxides) providing fade-resistant colors. Viscosity is engineered at 120-180 cP for optimal film formation.

This chemistry delivers benchmark performance. Accelerated testing (QUV-A 4000hrs) shows ΔE<1.0 for dark colors versus ΔE>8.0 for polyester systems. FTIR analysis confirms PVDF’s 98% crystallinity provides a barrier against acid rain (pH 3.0) and alkaline cleaners (pH 13.0). The resin’s inherent hydrophobicity (water contact angle 85-95°) minimizes dirt pickup. Compliance with AAMA 2605 requires: chalk resistance ≤8 (ASTM D4214), erosion resistance >3µm after 2500hrs QUV-B, and color shift ΔE<5 after 10yrs subtropical exposure. Crucially, PVDF’s thermoplastic nature allows post-forming without micro-cracking – DSC thermograms show no Tg below 150°C, enabling brake pressing to 0° bends. The formulation resists industrial pollutants, passing 3000hrs Kesternich test (SO₂ exposure) without blistering or gloss loss.

FAQ

Q: Are you trading company or manufacturer?

A: We are an industrial and trade company integrating production and sales, factory is located in Shandong Province, and in response to the new Free Trade Port policy, a trading company has be established in Hainan- FUODE.

Q: Do you provide samples? Is it free or extra?

A: Feel free to request small side samples or larger-sized samples for free by your freight collected number, allowing you to thoroughly evaluate the quality of our products before making a decision.

Q: Do you accept the third party inspection?
A: Yes, our products can be accept any third party to test the quality, and If the customer has any requirements, we can also accept the third-party testing before shipment.

Q: How could you guarantee your products?
A: Our quality management is according to the ISO9001 system, and the products has been passed CE, SGS, COC inspection

Q: What’s the MOQ?
A: Galvanized/Galvlume steel coils：50tons/thickness

  PPGI/ PPGL coils：300tons/thickness

Q: How long is your delivery time? 

A: Generally it is 7~15 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.