Corning 430320 Vacuum Filter System Tube Top with Polystyrene Filter Funnel, Orange HDPE Cap, Sterile, Cellulose Acetate Membrane Area, 0.22 Micron, 150mL Funnel Capacity (Case of 12) Vacuum tube top style polystyrene filter funnel has a 150mL capacity; minimizes unnecessary transfers by filtering directly into the 50mL centrifuge tube Cellulose acetate (CA) membrane has a 13.6sq cm area with a 0.22m pore size that provides fast flow rates and low protein binding, and is good for filtering cell culture media Polypropylene centrifuge tube is supplied with an individually wrapped orange HDPE plug seal cap for storage Individually packaged, sterile, certified nonpyrogenic, with a 3-year expiration date on the filter funnel and shipping box