PTFE Membrane Filters, 0.45 um, 142mm, Nonsterile, 50 per pack, SF15131 Regular Price $569.44 Price $495.17 Add to Cart PTFE Hydrophilic Membrane Filters, 0.45 um, 260mm x 300mm, Nonsterile, 50 per pack, SF17472 Regular Price $546.23 Price $474.99 Add to Cart Tisch Scientific Nylon Membrane Filter, 0.45 µm, 150 mm, Nonsterile, 50 Pack, SF13884