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