Production & Quality
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PU stress cracking
Problem Phenomenon
PU products crack under stress + chemicals in <100h
Cause Analysis
PU molecular chains under stress are attacked accelerated by chemicals; environmental stress cracking is a typical failure mode of polyolefins
Solution
1) Reduce product internal stress by annealing; 2) Select high molecular weight PU to improve ESC resistance; 3) Avoid contact with aggressive chemicals
Key Takeaway
Stress cracking is caused by stress-accelerated chemical attack; annealing and high MW are key
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