MILLEX® Sterile Syringe Filters Hydrophilic PTFE Membranes. MilliporeSigma. A 25 mm diameter sterile syringe filter with a 0.2 µm pore size hydrophilic PTFE membrane. Female Luer-Lok™ inlet and male Luer slip outlet Ethylene oxide sterilized Comes in a pack of 50. Compare this item.