Cellulose nitrate (CN) membranes are good for filtering buffers where protein binding is not a concern. 250mL receiver bottles feature easy grip sides for improved handling. Additional storage bottles can be purchased to increase capacity. Bottle caps are supplied sterile and individually packaged. Angled hose connector simplifies vacuum line attachment. Individually packaged, sterile and certified nonpyrogenic. Each system has the membrane material and pore size printed on the unit and is color-coded by membrane type for easy product identification. Expiration date appears on the filter funnel and shipping boxes. Expiration date of the membrane is three years from the time the product is manufactured.