PTFE Filters, 1.0 µm, 25 mm | Order High-Quality PTFE Filters, 1.0 60.0, 10.0, and 5.0-µm pore size PTFE filters are pure PTFE microfibers fused together at intersection points. These hydrophobic membranes provide ultimate chemical resistance and are temperature stable to 500 F (260 C). 2.0, 1.0, and 0.5 - µm pore size PTFE filters are