Molding Process
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PC Anti-UV Grade Yellowing
Problem Phenomenon
Outdoor PC parts yellow after a period of use, and light transmission and appearance deteriorate.
Cause Analysis
Ordinary PC has poor UV resistance; outdoor use without selecting an anti-UV grade or adding an anti-UV layer causes photodegradation and yellowing; ultraviolet rays trigger molecular chain breakage and chromophore formation.
Solution
①Select anti-UV grades for outdoor parts or co-extrude a UV protective layer; ②Evaluate the product's sun protection design; ③Do UV aging tests for verification; ④Add a UV coating on the surface when necessary; ⑤Control outdoor exposure conditions.
Key Takeaway
Outdoor PC 'must be equipped with a UV protection solution': ordinary PC not being sun-resistant is the material's nature; consider anti-UV at the material selection stage, as afterwards remediation is costly and ineffective.
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