Key principles.
UV-stable
Aluminum, steel, stainless: UV doesn't affect.
20+ year
Carbon-black plastics most UV-stable.
5-15 year
UV-stabilizer additives extend plastic life.
1-3 year
Standard ABS, PP, PE 1-3 years before degradation.
Powder coat
Powder coat 20+ year warranty for outdoor.
UV-stable
Type II decorative anodize UV-stable. 30+ year.
FAQ
UV photons break polymer chains. Color fades, embrittlement, cracking.
HALS (hindered amine), UV absorbers, antioxidants. Combined for best stability.
Standard plastic 1-3 year. Stabilized 5-15 year. Carbon-black 20+ year.
Coating provides barrier. Stabilizer reduces damage. Coating + stabilizer best.
ASTM G154 (UV-A fluorescent). G155 (xenon arc). Accelerated weathering.
Pantone-matched powder + UV-stable pigments best. Some colors (red) less UV-stable.
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