Molding Process
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POE toughened PP heat deflection temperature drops
Problem Phenomenon
POE/PP HDT drops from 100 to 70, below 80
Cause Analysis
POE elastomer softening point low, rigidity drops after addition
Solution
1) POE reduced to 8-10wt%; 2) Talc 10-15wt% to raise HDT; 3) Nucleating agent 0.2wt%; 4) High HDT copolymer PP
Key Takeaway
Toughening is accompanied by HDT drop, requiring filler reinforcement compensation
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