Detailed Product Description PTFE Membrane Felt for air filtrationDescription: 1) Material: polyester, polypropylene, aramid, acrylic, P84, PPS, PTFE2) Surface treatment: PTFE membrane laminating, heat set, singed, calendered3) Chemical treatment: a) -3 oil and water repellent treatment b) -11 PTFE membrane c)-12 PTFE coating d) -21, -22, -23 antistatic treatment Outer packing: In rolls