What is an LN2 storage dewar and what should UK labs know before buying one?

An LN2 storage dewar is a vacuum-insulated vessel used to store liquid nitrogen at cryogenic temperatures, maintaining the environment required to preserve biological samples including embryos, sperm, oocytes, stem cells, and tissue over extended periods. The vessel uses the same vacuum flask principle developed in the nineteenth century, refined with modern materials and manufacturing processes to meet clinical reliability standards.

What sizes of LN2 storage dewar are available for clinical use?

LN2 storage dewars for clinical use range from under 20 litres for compact bench-adjacent storage up to 300 litres and beyond for biobanking and archive applications. The most commonly used sizes in UK IVF and andrology settings are 35 litres and 50 litres, which balance capacity against the refill interval and the practical requirement for vessels that can be managed by lab staff without specialist handling equipment.

What does canister configuration mean in an LN2 storage dewar?

Canister configuration refers to the number and arrangement of canisters the vessel is designed to hold. Six canister configurations provide more clearance per position and faster retrieval. Ten canister configurations maximise sample positions within the same footprint. The choice determines how many samples can be stored and how efficiently staff can access specific items during time-pressured procedures.

How often does an LN2 storage dewar need refilling?

Refill frequency depends on vessel size, insulation quality, and how often the vessel is accessed. A well-maintained 50 litre LN2 storage dewar in clinical use typically requires refilling every six to eight weeks. Smaller vessels refill more frequently. Monitoring liquid nitrogen levels at defined intervals is a standard clinical requirement, and alarm systems should be in place for any vessel containing samples that cannot be replaced.

Which LN2 storage dewars does Cryolab supply to UK labs?

Cryolab supplies LN2 storage dewars across the full range of clinical capacity requirements. The CryoCan 47-10 is a ten canister 50 litre vessel designed for IVF and andrology use. The CryoNest XL serves larger capacity needs. Cryolab is ISO 9001:2015 certified and supplies the complete range of canisters, cryocanes, and consumables alongside every vessel. Visit cryolab.co.uk or call +44 1243 837177.