Aijiren PTFE membrane filter 0.2 um for hplc-Analytical Iso9001 0.22um hplc filter vials for filtration Aijiren-HPLC 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