Processing Machinery
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POM product chemical resistance decline
Problem Phenomenon
Products swell and crack after contacting fuel or solvents; the material itself has qualified chemical resistance but the processed parts fail.
Cause Analysis
Processing internal stress makes chemical media more likely to invade, triggering environmental stress cracking; degradation also lowers molecular weight, weakening the material's inherent chemical resistance.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Reduce internal stress (high mold temperature, low holding pressure); ②control processing thermal history; ③avoid sharp corner stress concentration design; ④perform compatibility verification according to the actual medium.
Key Takeaway
Chemical resistance failure is often related to the superposition of internal stress; mild processing technology and fillet design can maximize retention of POM's chemical resistance advantages.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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