they are mainly used in precision chemical ,dye chemical ,sugar ,pharmaceutical ,aluminum industry specification ... 2. Long service life 3.Matrial:Polyester 100% staple filter fabric 5.Thickness:2mm 6.Weight: 245gsm 7.Air Permeability ... less than 1 micron Application:For filter press,leaf filter,disc filter,drum filter or vacuum filter in chemical industry,pharmaceutical industry,metallurgy industry, ...