Processing Machinery
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PP Chemical Resistance Boundary
Problem Phenomenon
【Problem Phenomenon】PP parts swell and crack after contact with chemicals
Cause Analysis
PP has excellent chemical resistance (acids, alkalis, salts, alcohols), but aromatic hydrocarbons, chlorinated hydrocarbons and concentrated oxidizing acids attack it at high temperature; selection ignoring the boundary leads to failure; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Check against the medium list; verify for aromatic hydrocarbon and chlorinated hydrocarbon high-temperature occasions; avoid concentrated oxidizing acids; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PP chemical resistance is broad but has boundaries, verify aromatics and concentrated oxidizing acids; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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