... to a certain proportion. Comparing with the common filter material, Aramid needle felt has the advantages bellowed: ... optional : Polyester, PP, Acrylic , Aramid(Nomex), PPS , PTFE and a variety of compounded needle felt as your preferenceFinishing ... treatment : Singeing , calendaring, heat setting , PTFE memebrane , anti-acid/ alkali treatment , water and oil repellent ...