Apr 28, 2019 · HYDROPHOBIC PTFE SYRINGE FILTERS:Virgin PP housing with Hydrophobic PTFE membrane. Diameter: 25mm, Pore Size: 0.22μm. HYDROPHOBIC PTFE FEATURES: Hydrophobic PTFE membrane could resistant to almost all the organic solutions. (PH:1-14) ,also the Air/ Gas filtration. As well as has good mechanical strength, tear resistance, good bubble point