Material Analysis
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EVA creep deformation is large
Problem Phenomenon
EVA product creep under long-term load >5%, exceeding the 2% requirement
Cause Analysis
EVA elastomer nature has large creep; molecular weight too low with poor creep resistance; no crosslinking with large plastic flow
Solution
1) Select high molecular weight grade; 2) Slight crosslinking with 0.3wt% DCP to reduce plastic flow; 3) Add rigid fillers to reduce creep
Key Takeaway
Large creep is caused by the elastomer nature; slight crosslinking and rigid filler are key
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