onnov PVDF Coating VS Powder Coating.
The company Pennwalt developed a fluoropolymer coating for building based on polyvinylidene fluoride (PVDF) (trademark Kynar500) in 1965. Since then, PVDF coating has been used in buildings.
Rotary electrostatic spray application of PVDF coating is the most common application method. There are 2-COAT system, 3-COAT system, and 4-COAT system. It has excellent resistance to fading, anti-blooming, anti-air pollution (acid rain, etc.), strong UV resistance, strong crack resistance and ability to withstand harsh weather conditions.
The company Sames developed the powder electrostatic spray technology and the corresponding spraying equipment in 1963. Then powder coating spray technology was widely used in industrial production.
Electrostatic spray application of powder is the most common application method. The coating is good on impact resistance, abrasion resistance, corrosion resistance, weather resistance, etc. And this method is widely used in architectural and industrial products, which mainly used in windows and doors as well as other architectural buildings.
In order to ensure the coating performance, three AAMA specifications should be referenced: AAMA2603, AAMA2604, and AAMA2605. These three specifications apply to progressively stronger levels as indicated by South Florida outdoor exposure and laboratory accelerated testing results as shown below.
|AAMA Specifications – Organic Coatings on Aluminum|
|Expose Time||1 year, South Florida||5 year, South Florida||10 year, South Florida|
|Chalk resistance||1 year: “slight” chalk||5 yrs: Chalk < 8||10 yrs: Chalk < 8|
|Color Retention||1 year: “slight” fade||5 yrs: Fade ≤ 5 Delta E||10 yrs: Fade ≤ 5 Delta E|
|Gloss Retention||1 year: “slight” fade||5 yrs: ≥ 30% retention||10 yrs: ≥ 50% retention|
|Erosion Resistance||No specification||5 yrs: < 10% loss||10 yrs: < 10% loss|
|Humidity||1,500 hours||3,000 hours||4,000 hours|
|Salt Spray||1,500 hours||3,000 hours||N/A|
For coating manufacturer, generally a common exterior powder coating can meet AAMA2603, an improved super durable powder coating can meet AAMA2604, and PVDF coating can meet AAMA2605. It can be seen that PVDF coating has excellent anti-fading, anti-blooming, anti-air pollution (acid rain, etc.) corrosion resistance, strong UV resistance, strong crack resistance and ability to withstand harsh weather conditions. In addition to the abrasion resistance in terms of mechanical properties, impact resistance has excellent performance, especially in harsh weather and environment, showing long-term anti-fade and anti-ultraviolet properties.