PTFE membrane filters are strong and resistant to acids, bases, and solvents, and stable at high temperatures. With their low background and low tare mass Trace2 PTFE Membrane Syringe Filter, 25mm, 0.22μm, 100-pk. Product Size, Pack of 100 ; For Use With, HPLC, SPE ; Type, Syringe Filter ; Diameter (Metric), 25mm ; Disposable, Yes. CHROMAFIL ® Syringe Filters – Teflon (PTFE) Polytetrafluorethylene