hcachris wrote:Along the same lines...
if we look at the colorants selected for this match, better options may be available for the application. Red Oxide and Carbon Black (especially carbon black) are known for absorbing heat into the profile. If they absorb enough heat that the heat distortion level of the PVC is exceeded it will likely result in warping or oil canning. Pigment Black 7 has been banned in severla application for this reason alone...even in the substrate layer of a coextruded part.
If we switch to a co-ex capped product (ASA/Acrylic) keep in mind that the Heat build up is typically worse than in a PVC product due to the lower levels of TiO2 that are required for polymer stability.
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