Material Analysis
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HDPE Stress Cracking ESCR
Problem Phenomenon
HDPE container cracks after holding detergent, or breaks without warning during long-term use
Cause Analysis
HDPE environmental stress cracking resistance ESCR is an inherent weakness; media such as surfactants and grease accelerate crack initiation; the higher the molecular weight, the better the ESCR, and comonomers improve toughness
Solution
①Select high-ESCR grades for medium-contact scenarios; ②use high-molecular-weight copolymer HDPE for detergent containers; ③design to avoid stress concentration structures; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
ESCR is the core indicator for HDPE applications; grade selection determines crack resistance life more than process adjustment; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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