centrifuge tubes Max RCF: 18,000 Leak proof under p negative 0.06mpa for 5 minutes White area on the top of the cap JiuiĀ® Centrifuge TubesSpecial selected high-clarity polypropylene assures the manufacture good transparency, chemical resistibility and obdurability. Smooth, flat surface polypropylene caps for conical bottom tubes. The universal design make the tubes are suitable for most brand of ...