Material
What Is a PVDF Coating?
Also called: Kynar 500, Hylar 5000, fluoropolymer coating, 70% PVDF
PVDF (polyvinylidene fluoride) is a fluoropolymer resin used in the highest grade of factory-applied metal roofing finishes. A 70% PVDF coating — the architectural standard — resists fading, chalking, and chemical attack far longer than polyester or SMP paints, keeping a roof's color stable for decades.
In plain English
All painted metal roofs are not painted alike. Entry-level panels wear polyester paints that chalk and fade in years; architectural-grade roofs are coil-coated with PVDF — the same chemistry family as high-end non-stick and aerospace finishes — whose carbon-fluorine bonds simply don't break down under UV the way ordinary paints do.
How pvdf coating works
"70% PVDF" means the coating's resin is at least 70% fluoropolymer blended with 30% acrylic for film formation — the formulation behind trademarked systems such as Kynar 500® and Hylar 5000®. Applied and baked at the coil-coating line over primer and pretreatment, the finish is uniform in a way field painting can never be. Performance differences against polyester/SMP paints are dramatic in accelerated and South-Florida exposure testing: PVDF holds gloss and color, resists chalking, and shrugs off acid rain and salt atmosphere. Cool-roof versions add infrared-reflective ceramic pigments — the basis of coating systems like Interlock's Alunar® — reflecting solar energy even in dark colors.
Why it matters for your roof
The coating is what you actually see for the life of the roof. A lifetime substrate under a 10-year paint job fails aesthetically decades early; 70% PVDF is what lets a metal roof look like the day it was installed long after asphalt neighbors have been replaced.
Common problems
Confusing look-alike paints: "Kynar-like" or unspecified "premium paint" is usually SMP. The resin spec (70% PVDF) is the thing to verify in writing.
Don't confuse it with
Not to be confused with "Kynar-like" marketing paints — without the 70% PVDF resin spec, it isn't the same chemistry.
- PVDF vs SMP (silicone-modified polyester)
- PVDF vs plain polyester paint
Regional & climate notes
Most relevant in: Coastal environments, High-UV regions.
Frequently Asked Questions
What does "70% PVDF" actually mean?
At least 70% of the coating's resin is fluoropolymer (PVDF), blended with about 30% acrylic. That resin ratio — not the brand name — is what delivers the fade and chalk resistance.
Is Kynar 500 the same as PVDF?
Kynar 500® is a trademarked PVDF resin used in 70% PVDF coating systems — so all Kynar 500 finishes are PVDF, and competing resins like Hylar 5000® offer equivalent chemistry.
Do PVDF coatings come in cool-roof colors?
Yes — IR-reflective ceramic pigments let even dark PVDF colors reflect solar energy, the basis of CRRC-rated finishes such as the Alunar® coating system.
Related terms
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