Corning 431227 | 50mm Syringe Filter with PTFE Membrane, Pore Size: 0.2m,, PP Housing, Sterile. This Corning syringe filter has a polypropylene copolymer housing, a hose barb inlet, and a hose barb outlet. The polytetrafluoroethylene (PTFE) membrane provides the best chemical resistance. PTFE is naturally hydrophilic and can be used for venting