Production & Quality
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LDPE Environmental Stress Cracking
Fenómeno do problema
LDPE containers crack after holding detergent, the same ESCR problem as HDPE
Análise das causas
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
Solução
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
Conclusão principal
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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