Description Cryogenic vials are the ideal choice for long term storage of sample in the harshest environments. These thick-walled tubes are outfitted with silicone O-rings that allow them to maintain their seal at temperatures as low as -196°C. Sterilized by gamma irradiation, MTC Bio cryogenic vials are designed to hold, store and preserve biological materials for days, weeks, years, or decades. The self-standing starfoot base mates perfectly with an include rack so that one hand is all that is need to install and remove caps.   Temperatures as low as -196°C • Self-standing star foot • Leakproof silicone O-ring • Resealable bags of 50 • Gamma sterilized • Free locking rack • RNase, DNase, pyrogen, & endotoxin free   Specifications Material (tube/cap): LN2 grade polypropylene Material (o-ring/washer): Silicone Temp Range: -196°C to 121°C* Vial Diameter: 12.5mm *LN2 gas phase only; not for liquid phase