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THERMAL STABILTY CURVE 

You can observe two regions - operating region and degradation region in the graph. If you maintain the material in operating region moulding can be with out silver streaks / gas bubbles. If the condition of material shifts to degradation region, then you must expect silver streaks / gas bubbles in the moulding.

During the production run, varying residence time can vary the colour shade, if the pigment used is sensitive to residence time.

Also see Residence Time

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