0.45 Syringe Filter found in: Syringe Filter, PTFE, 0.45µm, 13mm Diameter, Yellow Nylon Syringe Filters, 0.45 µm, Syringe Filter, PES, 0.45µm, 13mm.. Denville Scientific Syringe Filters are constructed so that the sample must pass through the membrane, not leak around it.