Molding Process
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PU hardness too low
Problem Phenomenon
PU product Shore hardness 5-10 degrees lower than target, soft to touch
Cause Analysis
PU soft nature, low hardness; too much plasticizer or softener added; crystallinity too low
Solution
1) Add rigid filler 5-10wt% to increase hardness; 2) Reduce plasticizer dosage; 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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