Material Analysis
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Insufficient weather resistance/yellowing of high impact polystyrene ASA products
Problem Phenomenon
ASA products show yellowing, discoloration, or mechanical property decline after outdoor use, failing to achieve the expected weather resistance effect.
ASA is known for weather resistance.
Cause Analysis
(1) Insufficient weather resistance of the ASA grade, low acrylate rubber content
(2) High impact polystyrene processing temperature too high, partial material degradation affects weather resistance
(3) Improper surface treatment of high impact polystyrene products, direct ultraviolet exposure
(4) Insufficient anti-ultraviolet agent dosage
(5) High impact polystyrene regrind ratio too high, weather resistance decreases
Solution
(1) High impact polystyrene selects ASA grades with good weather resistance
(2) High impact polystyrene controls processing temperature within the 180-240°C range
(3) High impact polystyrene product surface coated with UV protective coating
(4) High impact polystyrene adds appropriate ultraviolet absorbers
(5) High impact polystyrene controls regrind ratio not exceeding 10%
Key Takeaway
ASA weather resistance is related to material grade and processing conditions; temperature control and grade selection are key.
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