Molding Process
6 Aufrufe
PPSU product yellowing and browning
Problembeschreibung
PPSU transparent amber products further darken and turn brown after processing.
Ursachenanalyse
Excessively high processing temperature or excessively long residence time causes thermo-oxidative degradation and color deepening.
Lösung
Control barrel at 340-360°C (low limit); nitrogen protection; shorten residence.
Wichtigste Erkenntnis
Although PPSU is ultra-high temperature stable, it still has a degradation boundary.
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