Production & Quality
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PPO Stress Cracking and Environmental Media
Fenómeno del problema
[Problem Phenomenon] PPO products crack after contacting specific chemicals, and assembly stress locations fail first
Análisis de la causa
PPO is sensitive to media such as cyclohexane, ethyl acetate, toluene, MEK, chloroform and acetone, and environmental stress cracking occurs under stress; the NPL guide lists a complete ESC media list
Solución
Check the use environment against the ESC media list; anneal high-stress parts to reduce residual stress; switch to PPO/PA alloy in sensitive environments to improve chemical resistance; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
For PPO stress cracking look at the media list; annealing plus alloying is the way out; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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