250mL Centrifuge Tubes for applications requiring large volume centrifugation include molded graduation lines. Centrifuge tubes are made of Polypropylene and are sterile. Polyethylene (HDPE) cap provides a secure closure. Additional info on MLS-CTFR-250J: Meets the requirements of BSE/TSE. DNase/RNase free and non-pyrogenic. Latex Free. Shelf Life: 3 years after month of production. Autoclavable at 121°C and freezable to -196°C. Sterilized by gamma irradiation SAL10 (ISO11137). Manufactured in a Class 100,000 cleanroom environment. Manufactured under ISO13485:2016 and ISO9001:2015 quality management system.