Does your PP contain a "Radiopacifier" based on Bismuth Trioxide
which partially ends up as a mould deposit?
If so, perhaps the molding conditions need to be adjusted
(less shear, lower temperatures, kitchen sink, etc. ...)
If bismuth trioxide is compounded into the resin and it is showing up
as residual on the processing equipment, one should also go back to
the compounding process. There are numerous issues that can be
created in the compounding of radiopaque fillers, and the bismuth
trioxide can on of the more problematic ones.
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