Aug 19, 2019 · Polytetrafluoroethylene (PTFE) can be divided into hydrophilic and hydrophobic types. (This type is hydrophilic on both sides. ) Hydrophilic type: filter liquid (organic solvent, strong acid and alkali solution, water solution) Diameter: 47mm, Accuracy (aperture): 0.22um Packaging: 50 pieces per package