Molding Process
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Stress cracking of PAR products
Problem Phenomenon
Cracks appear in the product during use or when contacting chemicals.
Cause Analysis
The molding cooling is fast and the internal stress is large; PAR has a stress cracking tendency to alkaline and polar solvents.
Solution
Raise the mold temperature to 120-160°C; fully anneal at 150-170°C/2-4h; avoid contact with sensitive chemicals.
Key Takeaway
PAR stress management is the foundation of high-reliability applications.
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