detailed product description features: 1) model no.: 840ab 2) strong force and good ventilation 3) mainly used in ceramics 4) weight (g/sqm): 460 5) density (root/10cm): 227.5 (warp), 117.5 (weft) 6) thickness (mm): 0.88 7) permeability (10 - 3cbm/sqm.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 polypropylene filter fabric is widely used because of great chemical assistance and great anti abration. for filter presses and centrifuge filters, pp material is the main type. we can provide best quality with competitive price for multi filament, mono filament and multi-mono filament