Injection molding process

Design guide

Guide to Avoiding Sink and Warp

Sink marks are indentations caused mainly by thermal contraction as the polymer cools in thick regions of plastic parts. Warp is a defect in which the surfaces of the molded part have unintended bending and twisting. Both are caused by material shrinkage due to non-uniform cooling of the molded polymer.


sink and wrap design guide

There are best practices to use when designing your part that can help avoid sinking and warping. Download Quickparts’ Guide to Avoiding Sink and Warp which covers:

  • Design guidelines
  • Material selection tips
  • Processing options
  • Root causes of sinking and warping 

Quickparts sales engineers consult on your project and can support you with design tips, material selection, or advice about the appropriate finish choices.

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