Oct 29, 2021 · Corning® 50 mm Diameter Syringe Filters, 0.2 µm Pore PTFE. Syringe Filters IMPORTANT UPDATE: Some items may be delayed in shipping or out of stock due to extremely high demand. Corning® 50 mm Diameter Syringe Filters, 0.2 µm Pore PTFE Membrane, Sterile, Individually Packaged, 12/Case. date: 2021-10-29.