Filter Media. wwPTFE (water wettable PTFE), TF (PTFE, hydrophobic polytetrafluoroethylene), PVDF (hydrophilic polyvinylidene fluoride), and Nylaflo™ (hydrophilic nylon) membranes; Pore Size. 0.2 and 0.45 μm; Typical Thickness. wwPTFE Membrane; 0.2 μm: 280 μm (11.0 mils) TF (PTFE) Membrane; 0.2 μm: 139 μm (5.5 mils) 0.45 μm: 135 μm (5.3