Injection Molding
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Yellowing of PAR '2079851475616104452 due to improper temperature control
Problem Phenomenon
The color of PAR products turns yellow and the transparency decreases.
Cause Analysis
The processing temperature is too high >320°C or the residence time is long, causing thermal oxidative degradation, and the aromatic structure oxidizes and turns yellow.
Solution
Strictly control the processing temperature at 280-310°C, not exceeding 320°C; shorten the residence time; add antioxidants when necessary.
Key Takeaway
Although PAR has good thermal stability, strict temperature control is still required.
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