Minisart® Syringe Filter, Polytetrafluorethylene (PTFE), Pore Size 0.45 µm, Non-Sterile, Male Luer Slip, Male Luer Slip, Pack Size 500 Added to Shopping Cart Minisart ® Acticosart with chemically inert hydrophobic PTFE is suitable for venting as well as filtration of gases with a pH of 3 - 12.