Molding Process
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Poor EVOH Chemical Resistance
Problem Phenomenon
EVOH products soaked in acid/alkali solvents show mechanical decline >30%
Cause Analysis
EVOH has high affinity for specific chemicals, being attacked and swollen; EVOH 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 EVOH chemical affinity; selecting chemical-resistant grade and coating are key
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