Material Analysis
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Poor chemical resistance of PU
Problem Phenomenon
After soaking in acid-alkali solvents, PU product mechanical properties decrease >30%
Cause Analysis
PU has high affinity to specific chemicals, being attacked and swollen; PU molecular chains attacked by chemicals and broken
Solution
1) Select chemical-resistant grade; 2) Slight crosslinking to reduce swelling; 3) Surface coating protection of products; 4) Add chemical stabilizer
Key Takeaway
Poor chemical resistance is caused by PU chemical affinity; selecting chemical-resistant grade and coating are key
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