Material Analysis
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Insufficient Weather Resistance/Yellowing of general purpose polystyrene ASA Products
Problembeschreibung
ASA products yellow, discolor, or their mechanical properties decline after outdoor use, failing to achieve the expected weather resistance effect.
ASA is known for its weather resistance.
Ursachenanalyse
（1）The weather resistance of the ASA grade is insufficient, and the acrylate rubber content is low
（2）The general purpose polystyrene processing temperature is too high, and the material partially degrades, affecting the weather resistance
（3）The surface treatment of general purpose polystyrene products is improper, and ultraviolet rays directly irradiate
（4）The anti-ultraviolet agent dosage is insufficient
（5）The general purpose polystyrene regrind ratio is too high, and the weather resistance decreases
Lösung
（1）general purpose polystyrene selects an ASA grade with good weather resistance
（2）general purpose polystyrene controls the processing temperature within the 180-240°C range
（3）general purpose polystyrene coats the product surface with a UV protective coating
（4）general purpose polystyrene adds an appropriate amount of ultraviolet absorber
（5）general purpose polystyrene controls the regrind ratio to no more than 10%
Wichtigste Erkenntnis
The weather resistance of ASA is related to the material grade and processing conditions, and temperature control and grade selection are the key.
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