Molding Process
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PPSU product yellowing and browning
Fenómeno del problema
PPSU transparent amber products further darken and turn brown after processing.
Análisis de la causa
Excessively high processing temperature or excessively long residence time causes thermo-oxidative degradation and color deepening.
Solución
Control barrel at 340-360°C (low limit); nitrogen protection; shorten residence.
Conclusión clave
Although PPSU is ultra-high temperature stable, it still has a degradation boundary.
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