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If the parts appear gray and dark for HFFR PBT processing?

Reffer:Editor:Author:Hits:-InputTime:2013-03-22 15:53:00

     If  the parts appear gray and dark for HFFR PBT processing?

        Themain causes:

It’s due to the decomposition of flame retardants.

Proposed measures:
To strictly control he molding temperature of the parts equal to or less than 255 ° C, and as far as possible to shorten the molding time, in order to avoid the long time duration of the molten material in the high temperature environment to cause the decomposition of the flame retardant.