Production & Quality
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EVOH Stress Cracking
Problem Phenomenon
EVOH products crack in <100h under stress + chemicals
Cause Analysis
Under stress, EVOH molecular chains are attacked by chemicals at an accelerated rate; environmental stress cracking is a typical failure mode of polyolefins
Solution
1) Reduce product internal stress by annealing; 2) Select high molecular weight EVOH 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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