Polypropylene felt is used for general applications where chemical and moisture attacks other fibers. Polypropylene offers high strength, excellent resistance to most acids and alkalis. Smoothness of fibers allow good cake release and resistance to blinding. Moisture absorption is virtually non-existent. This fabric media has very good resistance to both mineral and organic acids and generally good resistance to alkalis with the exception of sodium and potassium hydroxide above 200°F. Good resistance to most reducing agents. Polypropylene also has fair resistance to most organic solvents with the exception of ketones, esters and chlorinated hydrocarbons.