50 Sterile Syringe Filters PES, 0.22Um Pore Size, 33 Mm Membrane Diameter, Syringe Filter, HPLC, Non-Sterile, Hydrophilic, 13mm, 0.22 Micron, Pack of 10. Syringe Filters - Sigma-Aldrich High performance sterile and nonsterile syringe filters offered in a variety of membrane materials and pore sizes, tailored for sample preparation for HPLC,