micropore PTFE 0.2 micron filter for minerals-Analytical Oct 29, 2021 · Merck ptfe 0.2 micron filter for minerals-Voa Vial Supplier. Milliseal Membrane Seal, PTFE, 18 mm. This is a 18 mm Hydrophobic PTFE Membrane Filter with a 0.45 micron pore size. For use in Sterilizing filtration, bioassays, solvent filtration.