Centrifuge Bottle with Sealing Cap, (PC) Polycarbonate body, PP screw closure, Silicone gasket Transparent with excellent chemical resistance. Bottles feature wide-mouth sealing cap closure. 250-ml bottle is rated for speeds up to 27,500 x g. 500-ml bottle is rated for speeds up to 13,700 x g. When using the 250-ml bottle in the Sorvall GSA rotor, use the NALGENE centrifuge bottle adapter (Cat. No. DS3125-0250) available separately. . Nominal Capacity : 500 ml . Autoclavable/Transparent . NOTE: Before autoclaving, just set closure on top of the tube without engaging the threads. For proper performance these bottles must be filled to 80% of the total capacity. . . FOLLOW WEB-Link to ROTOR-MATCHING-GUIDE. Fits your choice in your rotor of your centrifuge?