Molding Process
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PES product post-shrinkage
Problem Phenomenon
PES products slowly change dimensions during use
Cause Analysis
The amorphous structure of PES allows molecular chains to continue relaxing at long-term use temperatures
Solution
Fully anneal to eliminate deformation frozen in; the post-processing and application temperature of the product should be lower than the HDT of PES
Key Takeaway
The dimensional stability of amorphous polymers requires sufficient post-processing
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