Our 0.22 micron PTFE filter can be made of booth hydrophobic and hydrophilic PTFE, so you can choose appropriate material based on your unique application. Material: Polytetrafluoroethylene ( PTFE) Micron Rating: 0.22 micron. Porosity: 85%. Maximum Operating Pressure: 5.5 bar. Working Temperature: up to 130℃.