Material Analysis
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EMA hardness too high
Problem Phenomenon
EMA product Shore hardness 5-10 degrees higher than target, feeling hard
Cause Analysis
EMA crystallinity too high increasing rigidity; too much filler added; cooling too fast with incomplete crystallization but rigidity frozen
Solution
1) Reduce cooling rate to complete crystallization and reduce hard feel; 2) Reduce filler addition; 3) Add plasticizer 0.5wt% to lower hardness
Key Takeaway
High hardness is caused by crystallization and filler; adjusting cooling and filler is key
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