... 0 Permeability m3/m2/min: 2.4 Detailed Product Description PTFE needle filter bag Gram weight(g/m2): 508 Thickness( ... ): 2.0 Permeability m3/m2/min: 2.4 PTFE needle filter bagMaterial: PTFE fiberSpecifications: Gram weight (g/m2)508Thickness(mm)2 ... professions, and it is used as seal, dustproof, quakeproof, heat-preservation, sound-insulated, filters, polishing. PTFE needle filter bag with cage filter