Polycarbonate open-top tubes have outstanding mechanical strength. Excellent for whole cell separations. For use up to 6,000 x g in refrigerated or non-refrigerated centrifuges. Translucent polypropylene copolymer has excellent chemical resistance. For low-speed centrifugation up to 6,000 x g. Both tubes have molded-in graduations and are supplied without closures. For proper performance must be filled to at least 80% of the total capacity.