Production & Quality
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PP Part Stress Crack Resistance
Problem Phenomenon
PP containers crack after holding detergent.
Cause Analysis
Some PP grades undergo environmental stress cracking in surfactant environments; areas with high internal stress crack first.
Solution
①Select ESCR-resistant grades; ②reduce internal stress; ③avoid high-stress assembly; ④perform media compatibility verification.
Key Takeaway
Verify ESCR before holding chemicals.
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