MTC Bio Internally Threaded Cryogenic Vials MTC Bio Internally Threaded Cryogenic Vials offer unparalleled protection for long-term storage of biological materials in even the harshest of environments, with their thick-walled tubes with silicone O-rings able to maintain a secure seal at temperatures as low as -196°C. Sterilized by gamma irradiation, these vials are designed to hold, store and preserve a range of biological materials for extended periods of time. The self-standing starfoot base ensures a secure fit with an included rack, allowing easy installation and removal with one hand. Features: 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