Features: 1) Model no.: 840AB 2) Strong force and good ventilation 3) Mainly used in ceramics 4) Weight (g/m2): 460 5) Density (root/10cm): 227.5 (warp), 117.5 (weft) 6) Thickness (mm): 0.88 7) Permeability (10 - 3m?m2.s): 26 8) We can also supply other polypropylene filters, such as 521, 522, 534, 750A, 750B, 110C, 4212 and 4878, according to your requirements. The weaving and density can be changed