The cryotube uses medical grade polypropylene [PP] as raw material and is a disposable laboratory consumable dedicated to storing biological samples. 
free from DNA, RNase, RNase and endotoxin. Sterilized by gamma irradiation.
In the gas phase liquid nitrogen [that is, in the gaseous environment above the liquid nitrogen]. it can withstand low temperatures to -196 °C.
The external screw cap can reduce the chance of sample contamination
The cap has a built-in silicone O-ring to prevent liquid leakage. When operating according to the standard, there is no bursting, good sealing and no leakage. The tightness can be guaranteed even at the lowest storage temperature, ensuring the safety of samples and laboratories.