... 2.4 Tensile strength(N/5*20cm): PTFE nonwoven filter bagMaterial: PTFE fiberSpecifications: Gram weight (g/m2)508Thickness ... calendaring and Teflon coating Applications: it is suitable in mechanical, mechanical and electrical, aviation, metallurgy, engine ... professions, and it is used as seal, dustproof, quakeproof, heat-preservation, sound-insulated, filters, polishing. PTFE nonwoven filter bag