Production & Quality
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Surface micro-cracks of PU
Problem Phenomenon
0.05-0.2mm micro-cracks appear on PU product surface, affecting appearance and strength
Cause Analysis
Internal stress of PU products too large, exceeding material yield stress; environmental stress cracking; product design stress concentration
Solution
1) Annealing treatment to release internal stress; 2) Product design avoiding sharp corners and stress concentration; 3) Select high molecular weight PU to improve crack resistance
Key Takeaway
Micro-cracks are caused by excessive internal stress; annealing and crack-resistant design are key
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