... . All kinds of surface finish, PTFE coating 1.The material of the dust filter bag: POLYESTER, PPS, NOMEX, PE, FIBERGLASS, PP, ARYLIC. 2 ... to the users requirement including round, trapezoidal, flat and profiled filter bag. 3.We can provide two different kinds of the ... filter bags, one is external filter bag, the other one is internal filter bag.We can meet the ...