1.Filter bag/ISO9001:2008 Certified. 2.Material: polyester, fiberglass, aramid, P84, acrylic, ... , PTFE and PTFE membrane 1.The material of the polyeser filter bag: (1) 100% POLYESTER (2) ANTI-STATIC POLYESTER (3) 100% POLYPROPYLENE ... provide two different kinds of the filter bags, one is external filter bag, the other one is internal filter bag. We can meet the different ...