Certified PTFE 0.2 micron filter for metals-Analytical Oct 29, 2021 · 0.2 Micron, PTFE Unlaminated Membrane Filters 0.2 Micron, PTFE Unlaminated Membrane Filters Our unsupported, hydrophobic, PTFE membrane filters are ideal for sterilization and venting applications involving air, gasses, and solvents/acids incompatible with most other filters.