ISO9001:2000 Face smooth, pore distribution Gram weight:720,800 Air permeability:20,80,150,1000 Thickness:2 ... filter cloth is now widely used in metallurgy, chemical industry, building materials, metallurgy, power generation, ceramics, machinery, mining, oil, dye, food processing ... filter cloth4 Non woven filter cloth specification:Model Material Gram weight (g/m2 ±30g) air permeability(L/m2·S at ...