Material:Polyester (PET), polypropylene (PP), Fiberglass, METAMAX, FMS, P84, Acrylic, PTFE Membrane etc. OEM ... . Nonwoven Needle Felt Filter Cloth forDust filter bagsMaterial: Polyester (PET), polypropylene (PP), Fiberglass, METAMAX, FMS, P84, Acrylic, PTFE Membrane etc. Application ...