Material Analysis
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POM chemical resistance boundary
Problem Phenomenon
POM parts corrode and powder on the surface after contact with strong acids or strong oxidants, while contact with fuel oil and solvents causes no harm
Cause Analysis
POM has excellent resistance to fuel oil, solvents, and detergents, but is not resistant to strong acids and strong oxidizing chemicals; copolymer grades have better chemical resistance than homopolymer, and material selection must be verified according to the medium
Solution
①Verify compatibility according to the medium in chemical contact scenarios; ②switch to other materials in strong acid and strong oxidant environments; ③prioritize copolymer grades when chemical resistance requirements are high; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM's chemical resistance is a selective advantage; the boundary of resisting fuel oil but not strong acids must be clarified in the material selection review; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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