Oak Ridge Centrifuge Tube, (PPCO) Polypropylene copolymer body, PP screw closure Polypropylene copolymer provides greater chemical resistance than polycarbonate and can be autoclaved repeatedly. Contact-clear tubes allow easy view of contents. Can be used up to 50,000 x g in refrigerated and non-refrigerated centrifuges. NALGENE sealing caps (Cat. No. DS3132-xxxx) are available for all sizes. (Or use Cat. No. 3139-xxxx Oak Ridge centrifuge tubes (polypropylene copolymer) with sealing cap. . Nominal Capacity: 30 ml . NOTE: Before autoclaving, just set closure on top of the tube without engaging the threads. For proper performance must be filled to 80% of the total capacity. . Autoclavable/Biohazard/Transparent/Leakproof† . . FOLLOW WEB-Link to ROTOR-MATCHING-GUIDE. Fits your choice in your rotor of your centrifuge?