Processing Machinery
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LDPE Chemical Resistance Boundary
Problem Phenomenon
LDPE containers swell and deform after holding aromatic solvents, while holding acids and alkalis causes no problem
Cause Analysis
LDPE resists most solvents at room temperature, but aromatic hydrocarbons and chlorinated hydrocarbons cause it to swell; mechanical properties decline after long-term contact; material selection for chemical environments must distinguish media types; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Switch to other materials for aromatic and chlorinated hydrocarbon environments; ② LDPE can be used with confidence in acid and alkali environments; ③ verify according to media concentration and temperature; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The boundary of LDPE chemical resistance lies in aromatic hydrocarbons and chlorinated hydrocarbons; swelling-type media are a veto item in material selection; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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