Extrusion & Post
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HDPE automotive fuel tank
Problem Phenomenon
The HDPE fuel tank leaks, or stress cracks after long-term contact with fuel
Cause Analysis
HDPE has good fuel resistance, but the single-layer structure has insufficient permeation resistance; fuel permeation increases the weight and may cause stress cracking; multi-layer co-extrusion or fluorination treatment improves the barrier; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Use a multi-layer co-extrusion barrier structure for the fuel tank; ②or fluorination surface treatment to improve permeation resistance; ③perform permeation and durability verification according to regulations; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The permeation resistance of HDPE fuel tanks relies on structure rather than the material itself; multi-layer co-extrusion is the industry standard solution; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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