Material Analysis
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HDPE chemical resistance
Problem Phenomenon
HDPE containers stress crack after holding strong oxidants, while holding acids and alkalis is fine
Cause Analysis
HDPE resists acids, alkalis and most chemicals, but not strong oxidants and certain hydrocarbon solvents; the superposition of ESCR and chemical environment accelerates failure; material selection needs to be verified according to the medium
Solution
①Perform compatibility verification according to the medium for chemical contact; ②switch to fluoroplastics for strong oxidant environments; ③evaluate cross-linked PE for hydrocarbon solvent scenarios; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
HDPE chemical resistance is a selective advantage; strong oxidants and hydrocarbons are the two boundaries; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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