Material Analysis
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Low PVA flexural modulus
Problem Phenomenon
PVA product flexural modulus <20% of the design value
Cause Analysis
PVA soft, low modulus; insufficient filler added or poor interface, no reinforcement effect; crystallinity on the low side
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 soft material and insufficient filler; adding rigid filler is the key
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