1.Venting quality ,low price and long using life; 2.High filtration efficiency and easy dust cleaning; 3.Various varieties; 1. ... , anti-static , water-proof and oil-proofing , glass fiber , special fiber filter material and filter bags , together with post- ... such as singeing , calendering , water-proof and oil-proofing , composite , coating , impregnation and filming , ect. 2. As good industry ...