Molding Process
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Yellowing of PC Products
Problem Phenomenon
The color of PC transparent products gradually turns yellow.
Cause Analysis
The processing temperature is too high (>320°C) or the residence time is too long, causing thermal oxidative degradation and producing colored oxidation products; the raw material antioxidant fails.
Solution
Strictly control the melt temperature at 270-300°C; shorten the residence time; use high heat-resistant grade PC; supplement antioxidants.
Key Takeaway
PC yellowing is an intuitive manifestation of degradation.
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