... you PET,PP,Acrylic,PPS,Nomex,P84,PTFE,FMS,Glassfiber Felt Material: Polyester fiberWeight (g): 500 Thickness (mm):2.0mm Air ... singeing, calendering, heat setting, Teflon coating and membrane. polyester needle felt adopt nonwoven workmanship, with the property of stable physical ... with PTFE membrane (on the surface of the needle felt), which with the property of smooth surface, water repelled ...