Molding Process
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MP hardness too low
Problem Phenomenon
MP product Shore hardness 5-10 degrees lower than the target, soft to the touch
Cause Analysis
MP inherently soft, low hardness; plasticizer or softener added too much; crystallinity low
Solution
1) add rigid filler 5-10wt% to increase hardness; 2) reduce plasticizer amount; 3) increase cooling rate to increase crystallinity
Key Takeaway
low hardness is caused by material softness and excessive plasticization; adding filler is key
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