Syringe Filters Corning® 50 mm Diameter Syringe Filters, 0.2 µm Pore PTFE Membrane, Sterile, Individually Packaged, 12/Case Product Number 431227 E-mail Print Quality Certificate These Corning® syringe filters have polypropylene copolymer housings, hose barb inlets and hose barb outlets. PTFE membranes provide the best chemical resistance