Material Analysis
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Low flexural modulus of PU
Problem Phenomenon
PU product flexural modulus <20% of design value
Cause Analysis
PU soft, low modulus; filler addition insufficient or poor interface, no reinforcing effect; crystallinity too low
Solution
1) Add 10-15wt% rigid filler to increase modulus; 2) Nucleating agent to increase crystallinity; 3) Select high modulus grade
Key Takeaway
Low flexural modulus is caused by material softness and insufficient filler; adding rigid filler is key
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