Certified PTFE Syringe Filter for HPLC European-Aijiren . 47mm 0.45um ptfe filter Restek-PTFE Membrane Filter Iso9001 0.45 micron hplc syringe filter Restek-Chromatography Syringe Filters Solvent Compatibility Chart 1 Protect any analytical system. 2 Extend LC column lifetime. 3 Achieve more reproducible analyses. 4 Variety of membranes, porosities, and diameters available. 5 Luer lock inlet