... all compound filter bag features:1) Material: polyester, polyprolene,aramid,P84,acrylic,PPS,PTFE and all compound needle punched filter felt.2) Can ... do all kinds of filter bags for liquid,and air filters ... polyester,polypeopylene,aramid,acrylic,P84,PPS,PTFE and compound filter felt.3) Used for normal or high temperature exhaust ...