Material Analysis
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Poor weather resistance and yellowing of PET products
Problem Phenomenon
PET products severely yellow after 6-12 months of outdoor use, and mechanical properties decline.
Cause Analysis
PET is sensitive to ultraviolet (UV) radiation; UV radiation causes photo-oxidative degradation; insufficient light stabilizer is added to the product.
Solution
Add UV absorbers (benzotriazole type) and HALS; use TiO2 ultraviolet screening agents; apply surface UV protective coatings.
Key Takeaway
PET outdoor applications must undergo light stabilization treatment.
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