Production & Quality
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LDPE Environmental Stress Cracking
Problem Phenomenon
LDPE containers crack after holding detergent, the same ESCR problem as HDPE
Cause Analysis
LDPE is as susceptible to environmental stress cracking as HDPE; surfactant-type media accelerate crack initiation; although the branched structure has good toughness, ESCR still requires grade assurance
Solution
① Select high-ESCR grades for media contact scenarios; ② avoid stress concentration in container design; ③ perform immersion verification with the actual media; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
ESCR is a common subject of the polyethylene family; LDPE also requires grade selection and verification according to the media; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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