MilliporeSigma™ PTFE Syringe Filter, 0.2μm, 50mm. Non-sterile syringe filter with a 0.2μm pore size hydrophobic PTFE membrane. PTFE Syringe Filter, 0.2μm, 50mm comes in a pack of 10. Pricing and Availability. Cytiva Whatman™ ReZist Air Venting Filter, 50mm, PTFE, 0.2μm, sterile.