Molding Process
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POE toughened PP hardness greatly reduced
Problem Phenomenon
POE/PP Shore D drops from 65 to 40, below 50
Cause Analysis
POE soft, D<30, drops greatly after adding 15-20wt%
Solution
1) POE reduced to 8-12wt%; 2) Talc 10-15wt% compensation; 3) PP/POE/talc ternary; 4) POE+nucleating agent to reduce hardness loss
Key Takeaway
Toughening is accompanied by hardness drop, requiring filler compensation
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