1.100% PP raw material production 2 .smooth surface,good air permeability. 3 .different treatment polypropylene needle felt 1) Weight 450- ... team 4) Strict quality control system1 - Good quality Polypropylene Needle Filter Felt made with advanced machinery 2 - Accordingly adjusted technical ... PE,Acrylic,pps,Nomex (M-Aramid),ptfe,fiberglass,p84 needle felt filter media. Also we can supply you high ...