Almost every research lab faces this decision at some point: is an ultra low temperature freezer at –80°C sufficient, or does the work require a cryogenic tank at –196°C? The answer depends on what is being stored, for how long, and under which regulatory constraints.
This comparison covers the key technical differences and gives clear guidance on which applications require which technology.
An ultra low temperature freezer (ULT freezer, also called a deep freezer or minus 80 freezer) is an electrically powered unit that reaches temperatures between –40°C and –86°C. Standard ULT units operate at –80°C.
ULT freezers are common in laboratory settings — for DNA and RNA storage, enzyme samples, virus isolates, and tissue samples in short-term biobanks. They are straightforward to operate, require no nitrogen logistics, and cost significantly less than cryogenic systems in upfront terms.
Their limitation lies in temperature stability. At –80°C, biochemical processes are not fully arrested. Lipid oxidation, protein degradation, and enzymatic reactions continue — slowly, but measurably. For samples planned for storage beyond two to five years, –80°C is not a safe long-term standard.
A cryogenic tank is a thermally insulated vessel that stores biological samples in liquid nitrogen or in the nitrogen vapor phase at –196°C. At this temperature, all biochemical processes stop completely.
Cryogenic tanks are the technology of choice for any sample that must retain full viability over years or decades: oocytes, sperm, embryos, stem cells, tissue, cell lines. They require a nitrogen supply and periodic refilling, but provide storage stability that no electrical system can match.
| Criterion | ULT Freezer (–80°C) | Cryogenic Tank (–196°C) |
|---|---|---|
| Temperature | –40 to –86°C | –196°C |
| Biochemical inactivation | Incomplete | Complete |
| Storage duration (cells) | 1–5 years (limited) | Decades |
| Power source | Electricity | Liquid nitrogen |
| Power failure risk | Critical failure point | No electrical dependency |
| Capital cost | Low to medium | Medium to high |
| Operating costs | Electricity (continuous) | LN₂ (consumption-based) |
| GMP suitability | Limited | Full |
| For IVF? | No | Yes |
| For biobanking? | Limited | Full |
ULT freezers are appropriate for:
The clear boundary: for human gametes, embryos, stem cells, and any clinical long-term storage, a ULT freezer is not sufficient. This is not a matter of preference — it is a regulatory and biological reality.
Cryogenic tanks are required for:
Institutions including the Qatar Biobank and the Finnish Red Cross rely on Consarctic® cryogenic tanks — because no alternative offers the same storage stability.
Every electric ULT freezer has a single critical vulnerability: power. A four to eight hour outage can raise internal temperature in a poorly insulated unit to –60°C or warmer. For sensitive biological samples, that means irreversible damage.
LN₂ cryogenic tanks have no electrical supply risk. Without any power at all, they hold target temperature for weeks if nitrogen levels are adequate.
This is not an academic point. Labs in areas with unstable power supply, in renovated buildings, or with extended network interruptions learn this difference through experience — often costly experience.
Consarctic® offers cryogenic tanks for every lab scale and application:
Many labs start with ULT freezers — for cost reasons or because sample volumes are still manageable. When research programs expand or clinical requirements increase, the shift to cryogenic storage becomes unavoidable.
Consarctic® supports this transition from planning through IQ/OQ installation to full integration with existing lab systems. The BIOFREEZE® Controlled Rate Freezer provides the critical link: it freezes samples in a controlled, programmed process before they are transferred to the cryogenic tank.
A ULT freezer cools electrically to –80°C. Biochemical processes continue slowly at that temperature. A cryogenic tank stores at –196°C using liquid nitrogen — complete biochemical arrest, decade-level stability, no electrical failure risk.
All human gametes (oocytes, sperm), embryos, stem cells, cellular therapeutics (ATMPs), and any sample planned for storage beyond five years. At –196°C only.
A ULT freezer draws continuous electricity — typically 10–15 kWh per day. A Consarctic® cryogenic tank with eccentric neck opening consumes significantly less LN₂ than standard designs (up to 30% less), making long-term operating costs competitive. For large biobank installations, cryogenic storage is often more cost-effective per sample than ULT over a ten-year horizon.
No. A ULT freezer cannot serve as a long-term backup for biologically critical samples — the temperature gap (–80°C vs. –196°C) is too large. For backup redundancy on critical samples, Consarctic® recommends secondary LN₂ systems with monitoring and automated alarms.
ULT freezers have their place. They are reliable, cost-effective solutions for short-term storage of non-critical samples in active research environments.
For everything that must survive long-term — that meets clinical requirements, that is irreplaceable and cannot be re-derived — there is one technology: cryogenic storage at –196°C.
Consarctic GmbH supports laboratories through the full transition, from first consultation through IQ/OQ commissioning and ongoing service. With more than 1,500 customers in over 30 countries, contact us to discuss your specific requirements.