The cryotube is made of medical grade polypropylene (PP) and is a disposable laboratory consumable specifically designed for storing biological samples. In the gas state environment of liquid nitrogen, it can withstand low temperatures up to minus 187 ℃. Freezing tubes are divided into 0.5ml freezing tubes, 1.8ml freezing tubes, 5ml freezing tubes, 10ml freezing tubes, and there are also plastic freezing tubes, cell freezing tubes, bacterial freezing tubes, and so on. Applied for low-temperature storage of samples, used to preserve samples such as whole blood, serum, and cells. After removing the freezing tube, it should be immediately placed in a 37 ° C water tank for rapid thawing. Gently shake the freezing tube to melt it completely within 1 minute, and be careful not to let the water surface exceed the edge of the freezing tube cover, otherwise contamination may occur.