Injection Molding
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Yellowing of PAR '2079851475616104452 due to improper temperature control
Fenómeno del problema
The color of PAR products turns yellow and the transparency decreases.
Análisis de la causa
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.
Solución
Strictly control the processing temperature at 280-310°C, not exceeding 320°C; shorten the residence time; add antioxidants when necessary.
Conclusión clave
Although PAR has good thermal stability, strict temperature control is still required.
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