Oct 29, 2021 · Syringe Filter, PTFE, 30mm diameter, 0.22um, 100/pk (Scientific Strategies # FPT250020-100PK) Polytetrafluorethylene is used for the filtration of aggressive chemicals, including acids and non-aqueous solvents, as well as for GC and HPLC sample preparation. 25mm Diameter. Polypropylene Housing. 0.2 micron filtration membrane.