Syringe Filter PTFE Membrane 100 PCs, 0.22um Pore Size 13mm Uniform Pore Size - PTFE Syringe Filter with uniform pore size, high porosity, and high retention efficiency. 13mm disc diameter, 0.22μm, pore size, 100 pcs Chat Now PTFE Membrane Filters Aug 4, 2008 *Following ASTM D 2986-95A 0.3 µm (DOP) at 32 L/min/100 cm2 filter media. Description.