How can i prevent the yellowing of PC (Polycarbonate) in long residance time in injection molding?

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Gyorgy Banhegyi

One of the most important things is to dry it very well before injection molding. hydrolytic degradation followed by thermo-oxidative degradatio is the most common cause of discoloration in PC. If degratio occurs the flowability of the melt increases.

http://www.plastics.covestro.com/Products/~/media/B6555362438341FF9804F21A253E5B23.ashx?la=en

http://www.ptonline.com/articles/find-the-source-of-visual-defects

http://viewmold.com/Injection%20Mold%20Management/Injection%20molding%20defects/molding%20discoloration.html

Florentin Berthet

I agree with Pr Banhegyi, drying is major thing

and may you should try a heat resistant grade of PC