Molds & Tooling
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Post-shrinkage of PAR products
Problem Phenomenon
The product continues to shrink and change in size after demolding.
Cause Analysis
PAR cools quickly but still undergoes post-shrinkage (physical aging) below Tg.
Solution
Fully cool in the mold; anneal at 150°C after demolding to release stress.
Key Takeaway
PAR post-shrinkage affects dimensional accuracy.
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