Filson 0.2 micron PTFE filter has absolute micron rating of 0.2, therefore most particles larger than 0.2 micron will be removed. In addition, our 0.2 micron PTFE filter has a high filtration efficiency up to 99.99%, and you can get a overall lower cost than conventional filters. Material: Polytetrafluoroethylene ( PTFE) Micron Rating: 0.2 micron