Our factory selects high quality polypropylene fiber to make felt. Its chemical properties are stable, acid proof, alkali proof, and organic solvent proof. Physics properties are good, and the surface is smooth, hard and wearable; breaking strength is great, and recovering is good. It has high air permeability, and it is difficult to block the filtration passage. It is easy for washing. No seepage makes less pollution. It also has the characters of precious filtration, long lifetime and easy to operate etc. Because of its great properties, it is widely used in various industries.