PES膜 聚醚砜 FDA认证 Polyethersulfone resins 177.2440  

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net chloroform soluble extractives in Distilled water at reflux temperatures for 2 hours    
net chloroform soluble extractives in 50 % ethanol at reflux temperatures for 2 hours   
net chloroform soluble extractives in 3 percent acetic acid at reflux temperatures for 2 hours   
net chloroform soluble extractives in 3n -heptane. at reflux temperatures for 2 hours