Molding Process
3 visualizações
PPSU product yellowing and browning
Fenómeno do problema
PPSU transparent amber products further darken and turn brown after processing.
Análise das causas
Excessively high processing temperature or excessively long residence time causes thermo-oxidative degradation and color deepening.
Solução
Control barrel at 340-360°C (low limit); nitrogen protection; shorten residence.
Conclusão principal
Although PPSU is ultra-high temperature stable, it still has a degradation boundary.
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