Production & Quality
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PVA stress cracking
Fenómeno do problema
PVA product cracks under stress + chemical action in <100h
Análise das causas
Under stress, PVA molecular chains are attacked and accelerated by chemicals; environmental stress cracking is a typical failure mode of polyolefins
Solução
1) Reduce product internal stress by annealing treatment; 2) Select high molecular weight PVA to improve ESC resistance; 3) Avoid contact with aggressive chemicals
Conclusão principal
Stress cracking is caused by stress-accelerated chemical attack; annealing and high MW are the key
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