Sterlitech - PTFE Membrane Filter, Unlaminated, 0.2 um, 90 mm Diameter, 10/pk - PTU029010. 81.67. Get Quotations. Biomed Scientific Syringe Filter PTFE Membrane 25mm Diameter 0.45um Pore Size non Sterile Pack of 100. 56.99. Get Quotations. Membrane Filter, Hydrophilic PTFE, 47mm, 0.45um (Pack of 50) 40.0. Get Quotations.