0.2 Micron, 90mm, PTFE Unlaminated Membrane Filters. 10/Pk. PTFE Unlaminated. $89.24. + -. Add to Cart. Our unsupported, hydrophobic, PTFE membrane filters are ideal for sterilization and venting applications involving air, gasses, and solvents/acids incompatible with most other filters. These filters are ideal for your labs operations and tasks.