These syringe filters are recommended for “pharmaceutical” grade HPLC Sample Prep & Dissolution Testing when GLP and GMP are required. Manufactured with Syringe Filter for Sale – HPLC Vials Pore size: 0.22μm/0.45μm. Diameter: 13mm/25mm. Membrane: Nylon, Hydrophilic PVDF, Hydrophilic PTFE, Hydrophobic PTFE, PES, MCE, Hydrophilic PP,