Material Analysis
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Poor PVA chemical resistance
Problem Phenomenon
After immersion in acid, alkali or solvent, PVA product mechanical properties decrease >30%
Cause Analysis
PVA has high affinity for specific chemicals and is eroded and swelled; PVA molecular chains attacked by chemicals and broken
Solution
1) Select chemical-resistant grade; 2) Slight crosslinking to reduce swelling; 3) Product surface coating protection; 4) Add chemical stabilizer
Key Takeaway
Poor chemical resistance is caused by PVA chemical affinity; selecting chemical-resistant grade and coating are the key
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