Material Analysis
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Low-Temperature Brittle Cracking of PE Products
Problem Phenomenon
HDPE/PE products crack and break brittlely in winter or low-temperature environments, yet pass room-temperature tests.
Cause Analysis
HDPE has high crystallinity; its toughness decreases at low temperatures and it is notch-sensitive, so sharp corners and weld lines easily crack at low temperatures; LDPE/LLDPE have better low-temperature resistance, but improper grade selection still causes problems.
Solution
①Select high-impact/low-temperature-resistant grades for low-temperature applications; ②Eliminate sharp corners in the structure and keep weld lines away from stressed areas; ③Perform drop/impact verification at the actual low temperature; ④Avoid large-deformation assembly at low temperatures; ⑤Switch to LDPE/LLDPE or toughened modified material if necessary.
Key Takeaway
PE low-temperature brittle cracking = double insurance of 'grade + structure': HDPE in particular requires vigilance against low-temperature notch sensitivity; passing at room temperature does not mean passing at low temperature — verification must simulate the real use temperature.
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