Tisch Scientific PTFE Syringe Filter, 0.45 µm, 25 mm, Luer-Lok/Luer Slip, Non-Sterile, 100 Pack, SF14469 Tisch PTFE Syringe filters are very versatile, proving to be effective for applications such as alkali filtration, strong acid solvent filtration, and organic solvent with strong chemical causticity filtration.