TF (PTFE) Membrane Disc Filter 0.2um pore size. 142mm diameter. For air/gas filtration and venting applications. HPLC certified for nonaqueous mobile phase filtration and degassing. Chemically resistant. Hydrophobic PTFE polypropylene support. 25/pk. Pall Filter 66146. TF (PTFE) Membrane Disc Filter 0.2um pore size. 293mm diameter.