1.Filter bag is exquisite sewing.. 2.Material: polyester, fiberglass, aramid, P84, acrylic, PPS, PTFE and ... PTFE membrane surfac filter bags 1.Filter bag is exquisite sewing.. 2.Material: polyester, fiberglass, aramid, P84, acrylic, PPS, PTFE and ... company imported from Japan the three-needle and six-thread sewing unit that produces duster bags specially and can process bags ...