Material Analysis
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EVA toughness is insufficient with brittle fracture
Problem Phenomenon
EVA product elongation at break <50%, brittle fracture without yielding
Cause Analysis
EVA molecular weight too low with insufficient toughness foundation; excessive crosslinking losing toughness; coarse crystallization increasing brittleness
Solution
1) Select high molecular weight EVA to improve toughness; 2) Control crosslinking degree to avoid excess; 3) Nucleating agent to refine crystallization and improve toughness
Key Takeaway
Insufficient toughness is caused by low molecular weight and coarse crystallization; selecting high MW is key
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