● Made of medical grade polypropylene; can be repeatedly frozen and thawed
● Multiple threads for super sealing performance
● Thickened tube wall (explosion proof) and cap for safe sample storage
● Black graduation printing and white writing area
● DNase & RNase free, endotoxin-free, foreign DNA free
● Working temperature: stable from -196°C to 121°C
● Suitable for liquid nitrogen freezing (gas phase)