Benchmark's C1005-TBK5 5 ml centrifuge tube takes the conveniences of standard 1.5 ml tubes and scales them up for larger volumes. These polypropylene tubes come with an attached cap that provides a tight, leak-proof seal. They can also be effortlessly opened (or closed) with one hand. The cap is designed to provide a secure seal from -86 C to +80 C. CapLock Clips are available to maintain the integrity of the seal at extreme temperatures. In heated applications, the tube may be "boiled" for up to 10 minutes. At temperatures above 80 C, the use of the CapLock is recommended. The tubes are made of maximum clarity, low-binding virgin polypropylene and are certified RNase & DNase free. C1005TBK5 5 ml tubes are sized to be compatible with all Benchmark and standard German-designed equipment, including centrifuges, dry bath block heaters, tube racks and thermal shakers/vortexers. The 16 mm tube diameter is identical to the diameter of standard 15ml tubes, which ensures further compatibility with centrifuge rotors, etc. In many applications, these tubes have replaced 15ml tubes, dramatically reducing plastic waste, storage space and shipping costs. Maximum centrifugal force: 25,000 xg (when properly supported in an appropriate rotor cavity). Comes in an opaque black color.