... , PTFE and all compound needle punched filter felt 2) Can do all kinds of filter bags for liquid, and air filters ... as polyester, polypropylene, aramid, acrylic, P84, PPS, PTFE and compound filter felt 3) Used for normal or high temperature exhaust filtration ... in chemical, carbon black, iron and steel, non-ferrous metallurgy, coal-fired boiler, refractory and cement ...