Corning syringe filters are 100% integrity tested and are certified nonpyrogenic and noncytotoxic and are manufacturered in accordance with ISO 9002 standards. A variety of membranes are available to meet your needs. PES for low protein binding and faster flow rates; surfactant-free cellulose acetate (SFCA) for the lowest protein binding; PTFE for chemical resistance; and regenerated cellulose (RC) the best choice for DMSO compatibility.