They allow for the long-term storage of fragile samples like stem cells, eggs and sperm. Samples are ideally stored at temperatures below -135°C the limit at which virtually all biological functions stop. For the most important samples, this is the only way to defend against the natural breakdown of cells.
Liquid nitrogen freezers consume 1% of the energy of equivalent mechanical freezers
Even when stored in nitrogen vapour -190oC is achievable, even at the top of the freezer
Some models can maintain cryogenic temperatures for up to 37 days even without a fresh LN2 supply
No need for expensive HVAC systems
With very few moving parts LN2 cryogenic freezers provide many years of reliable service
Up to 94,500 vials (2ml) or 1,046 blood bags (25ml)
Vapour storage provides ease of handling, without the risk of LN2 drag out