Oct 29, 2021 · Hydrophobic PTFE Membrane - Transducer Protector,Syringe Filters,Air Vent Filter - Finetech Research and Innovation Corporation Pore Size:0.2um, 0.22um, 0.45um, um, 3um, 5um, 0um More-Details: Description PTFE membranes are hydrophobic in nature and are effective barriers for microbes and particulate matter.