One of the most popular fibers used to manufacture fabric today is polypropylene. It can be woven into a variety of thread counts to allow from loose to tight filtration applications. Polypropylene is good for use in temperatures from 50 to 180 (use up to 250â?? under limited applications is acceptable, but we would not recommend it). Benefits: Acid-resisting, Alkali-resisting, Heat resistance (180 ), Hydrolysis-resisting. Application: Nickel ionic filteration, Iron ionic filteration, Other metal ionic filtration.