Corning® 50 mm Diameter Syringe Filters, 0.2 µm Pore PTFE Membrane, Sterile, Individually Packaged, 12/Case. Product Number 431227. E-mail Print. prev. next. Quality Certificate. These Corning® syringe filters have polypropylene copolymer housings, hose barb inlets and hose barb outlets. PTFE membranes provide the best chemical resistance. These naturally hydrophobic membranes can be used for venting applications or filtering gases.