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