BP Series (Polypropylene Felt) BagsAn assortment of filtration ratings is offered from 1 to 200 microns to comply with any filtration requirement. The bags are manufactured from felt due to its high solids loading capabilities, in comparison to similar mesh fabrics. The media is created by needle-punching two layers of synthetic fibers together in a supporting scrim. A glazed finish, created by melting the outermost surface fibers, is used to produce a bond that reduces the possibility of migration. Typical applications: Acids, Alkalis, Corrosive Fluids, Micro-organisms, Oils, Organic Solvents.