HYDROPHILIC PTFE SYRINGE FILTERS: Virgin PP housing with Hydrophilic PTFE membrane (PP support layer). Diameter 25mm, Pore Size: 0.45μm. HYDROPHILIC PTFE FEATURES: Hydrophilic PTFE membrane has good mechanical strength, tear resistance, the contact angle of less than 20 °, good bubble point , high porosity, high flow rate.