These rugged Polypropylene Centrifuge Bottles from Globe Scientific are suitable for low to moderate speed centrifugation when filed to 80% of their nominal capacity. Re-usable and autoclavable, the bottles are designed with leakproof linerless closures. Bottles are molded with consistent wall thickness for excellent performance and have excellent chemical resistance.Centrifuge Bottle Features:Consistent wall thickness for low to moderate speed centrifugationPolypropylene (PP) bottle and cap with integral seal ring for leakproof closureBottle must be filled to 80% of volume for proper performance250mL Bottle - 27,500 x g500mL Bottle - 4,800 x gRe-usable and autoclavable at 121°CExcellent chemical resistance