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