Wholesales 0.22 um PTFE filter Teffil Syringe Filter PTFE for HPLC PTFE syringe filters are made of Polytetrafluoroethylene (PTFE) membrane and a polypropylene overmold housing. Available in 13 mm and 25 mm diameters and 0.22 μm and 0.45 μm pore sizes.