A storage dewar is a vacuum-insulated vessel used to maintain liquid nitrogen at cryogenic temperatures over an extended period, creating a stable environment for preserving biological samples such as embryos, sperm, oocytes, tissue, and cell lines. The term distinguishes static storage vessels from dry shippers, which are designed for transport rather than long-term in-lab storage.
What determines the right storage dewar size?
Size selection depends on sample volume, access frequency, and available floor space. Smaller dewars in the 20 to 35 litre range suit clinics with modest active inventories or satellite storage needs. The 50 litre size is the most common in busy IVF and andrology settings. Larger vessels from 80 litres upward are used for archive storage or high-throughput biobanking operations.
What is the difference between a storage dewar and a dry shipper?
A storage dewar is designed to remain stationary in a laboratory. It is optimised for long hold times, high canister capacity, and easy access during daily clinical operations. A dry shipper contains absorbent material that holds liquid nitrogen in a bound state, making it safe for transport and air freight. Using a storage dewar for transport risks liquid nitrogen spillage and is not compliant with IATA regulations.
How long does a storage dewar hold its charge?
Hold time depends on vessel size, insulation quality, and access frequency. A well-insulated 50 litre storage dewar holds charge for 50 to over 100 days under static conditions. Real-world hold time in a clinical environment with daily access is shorter. Monitoring liquid nitrogen levels at defined intervals is a standard requirement for clinical cryogenic storage.
Which storage dewars does Cryolab supply?
Cryolab supplies a range of storage dewars for clinical and research use. The CryoCan 47-10 is a ten canister 50 litre storage dewar suited to active IVF and andrology use. The CryoNest XL serves labs requiring larger capacity within the same quality standard. Full range at cryolab.co.uk.
