Production & Quality
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COC UV Light Yellowing
Problem Phenomenon
COC products used outdoors or in ultraviolet environments gradually yellow and their light transmittance decreases, while indoor parts are normal, and the same batch of material performs very differently.
Cause Analysis
COC has limited UV resistance, and ultraviolet radiation causes photo-oxidation and coloration; grades without UV stabilizers are not suitable for outdoors; cumulative light dose determines the yellowing speed.
Solution
①Select UV-stabilized grades for outdoor applications; ②apply UV protective coating on the product surface; ③verify material selection by QUV accelerated aging; ④make regular replacement plans for outdoor optical parts.
Key Takeaway
COC is not a naturally weather-resistant material; UV-stabilized grades are a prerequisite for outdoor applications; accelerated aging data supports life design.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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