Mar 03, 2013 · Description #3 by eBay: Sterile Syringe Filter, PTFE, 25mm diameter, 0.45um, Individually Packaged, 25/pk 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 0.45 micron filtration membrane Luer lock