Polytetrafluoroethylene (PTFE) membranes are Triton-free, have a bidirectional membrane support, one threaded end and one barbed end (50 mm dia) for a secure fit to the syringe. Membrane type and pore size are printed on each filter for easy identification. The syringe filters are 100% integrity tested and manufactured in accordance with ISO 9002 standards. They are certified nonpyrogenic, noncytotoxic, and are blister packed. Unaffected by most organic solvents, concentrated acids and bases, propellants, and cryogenic fluids Ideal for sterilization of gas and alcohols; cleaning acids, alkalis, and organic solvents; venting purposes. Use with aggressive chemicals