Lab Dewar flasks are essential laboratory and scientific equipment designed for the safe and efficient storage of cryogenic liquids like liquid nitrogen, dry ice, and other low-temperature materials. These specialized vessels maintain extreme temperatures by minimizing heat transfer, crucial for research, biological sample preservation, and material science applications. Products were evaluated based on insulation performance, capacity, construction materials, design features, user reviews, and feature analysis.
SCILOGEX Wide Mouth DILVAC Stainless Steel Cased Dewar Flask 4 Liter – for Liquid Nitrogen, Liquified Gases & Dry Ice – Cryogenic Storage Double-Walled Glass with Lid Clamps & Vented Lid
$653.00
The SCILOGEX Wide Mouth DILVAC offers robust stainless steel casing, a generous 4-liter capacity, and a wide mouth design for versatile cryogenic storage and easy access.
Search on AmazonLabasics Lab Dewar Flask, High Borosilicate Glass Vacuum Silvered Liner, Tall Flask, 350 ml Capacities, Ideal for Dry Ice and Liquid Nitrogen Storage
$128.99
The Labasics Lab Dewar Flask, with its 350 ml capacity and high borosilicate glass vacuum silvered liner, provides an economical solution for smaller-scale cryogenic storage needs.
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U.S. Solid 3L Liquid Nitrogen Container LN2 Tank Cryogenic Dewar Semen Flask with Straps 6 Canisters Carry Bag
$199.49
The U.S. Solid 3L Liquid Nitrogen Container is a specialized LN2 tank with tested evaporation rates and includes practical accessories like canisters and a carry bag, indicating a comprehensive and high-end solution.
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- Capacity: 350 ml
- Versatile Laboratory Use: Ideal for storing liquid gases, low-temperature research, and protecting crystalline components; commonly used with cold traps to prevent solvent absorption into vacuum pumps
- Premium Design: Features an aluminum outer shell and high borosilicate glass vacuum silvered liner for excellent insulation and high sealing performance
- Safety Precautions: Dewar flasks are high-vacuum glass containers; please always use with safety devices and wear protective eyewear during operation to ensure safety
- Warranty: 1-year coverage period for your peace of mind, if received damaged, please let us know and we will solve it promptly
- WIDE MOUTH CRYOGENIC DEWAR FLASK – Stainless steel cased Dewar designed for safe storage and transport of liquid nitrogen, liquified gases, and dry ice in laboratory, medical, and industrial applications.
- ROBUST, HYGIENIC CONSTRUCTION – Features a rust-free, non-corrosive stainless steel outer case with double-walled borosilicate glass interior, vacuum pumped and silvered for maximum thermal efficiency.
- EASY ACCESS & MINIMAL COOLANT USE – Wide mouth design allows quick access to contents and shallow form reduces coolant requirements, making it cost-effective for flash freezing, specimen storage, and sample handling.
- SECURE LID CLAMPS & VENTED LID – Durable lid clamps ensure spill-resistant transport, while the vented lid improves safety by reducing pressure buildup during use and transit.
- SCILOGEX QUALITY AND EXPERT SUPPORT - Headquartered in Rocky Hill, CT, USA, SCILOGEX offers premium laboratory equipment and expert post-sales service and support. Our equipment is favored by life science professionals, researchers, advanced hobbyists and...
- Product Type: LAB SUPPLY
- Package length: 12.0"
- Package width: 4.72"
- Package height: 7.0"
- Capacity: 1000 ml
- Versatile Laboratory Use: Ideal for storing liquid gases, low-temperature research, and protecting crystalline components; commonly used with cold traps to prevent solvent absorption into vacuum pumps
- Premium Design: Features an aluminum outer shell and high borosilicate glass vacuum silvered liner for excellent insulation and high sealing performance
- Safety Precautions: Dewar flasks are high-vacuum glass containers; please always use with safety devices and wear protective eyewear during operation to ensure safety
- Warranty: 1-year coverage period for your peace of mind, if received damaged, please let us know and we will solve it promptly
- ➤【COMPACT 50 mm CALIBER】10L Liquid nitrogen container small diameter allows for longer storage and cycle, while large diameter will cause liquid nitrogen leakage.
- ➤【AEROSPACE MATERIALS】The liquid nitrogen container is made of high-strength aerospace aluminum material, which is strong and durable, store liquid nitrogen with a slower evaporation rate.Optimized design process, aviation paint, less welds...
- ➤【WIDE APPLICATION】The liquid nitrogen dewar can be widely used in farms, research institutes, laboratories, hospitals, beauty salons and other units.
- ➤【PLEASE NOTE】Due to air traffic control, we will only send you empty liquid nitrogen dewar. You can buy liquid nitrogen locally, which is cheap and very convenient. And the storage time range is in completely sealed condition. If you keeps it...
- ➤【CANISTERS】Each of the liquid nitrogen dewar come with six canisters;4 canisters come with holes at the bottom to store biological specimen and 2 sealed canister for dipping,Canisters Diameter 12" (30.5 cm) Height 21.65" (55 cm)
- Lightweight and Durable Material: The liquid nitrogen tank is crafted from high-strength aviation-grade aluminum alloy, ensuring both portability and durability. This material effectively protects the stored liquid nitrogen and prevents scratches and...
- Vacuum Insulation Design: Surrounding the liquid nitrogen container with a multi-layer insulation structure and special gas adsorbents creates an excellent vacuum storage space. This minimizes heat transfer, maintaining a stable low-temperature...
- 6 Canisters: Our liquid nitrogen dewar is equipped with 6 canisters, including 2 without holes for precise nitrogen extraction and 4 with holes for storing samples, allowing users to quickly access or replace stored materials as needed.
- Portable Carry Bag: The protective cover prevents scratches and damage from accidental impacts, and adds an extra layer of protection. It's also easier to transport and carry, ensuring the cryogenic tank can be safely transported to laboratories...
- Wide Applications: The LN2 container is widely used in laboratories, medical institutions, farms, beauty salons, and more. They can safely store a variety of samples, including semen, embryos, cells, dry ice, and metal materials, meeting diverse needs...
- Product Type: LAB SUPPLY
- Package length: 9.9 cm
- Package width: 10.8 cm
- Package height: 24.1 cm
- CAPACITY: The U.S. Solid Cryogenic Container Liquid Nitrogen Tank Dewar can hold up to 3 Liters of liquid nitrogen
- DEWAR: Dewars are designed for the sole purpose of holding extremely cold liquids such as liquid nitrogen; They have the shape, capacity, and material construction to store liquid nitrogen with a slower evaporation rate
- EVAPORATION RATE: We test the evaporation rate of our liquid nitrogen tanks by completely filling them with liquid nitrogen and tracking the rate of evaporation
- CANISTERS: Each of the liquid nitrogen tanks come with six canisters; Four canisters come with holes at the bottom to store biological specimen and 2 sealed canister for dipping
- SATISFACTION GUARANTEE: All U.S. Solid products come with a one year satisfaction guarantee; Please feel free to call our customer service department with any comments or concerns that you may have
- Capacity: 665 ml
- Versatile Laboratory Use: Ideal for storing liquid gases, low-temperature research, and protecting crystalline components; commonly used with cold traps to prevent solvent absorption into vacuum pumps
- Premium Design: Features an aluminum outer shell and high borosilicate glass vacuum silvered liner for excellent insulation and high sealing performance
- Safety Precautions: Dewar flasks are high-vacuum glass containers; please always use with safety devices and wear protective eyewear during operation to ensure safety
- Warranty: 1-year coverage period for your peace of mind, if received damaged, please let us know and we will solve it promptly
- This flask incorporates the convenience of a coated handle
- Increased portability and pouring efficiency
- Dewar lip is extended to facilitate pouring
- Vented polyethylene lid helps to minimize evaporation
This article is part of our complete guide Lab & Scientific Equipment — browse all our comparisons and buying guides.
Last update on 2026-07-16 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Lab Dewar Flasks
Capacity and Application Specificity
When selecting a lab Dewar flask, the intended capacity and specific application are paramount. For small-scale, general laboratory tasks or short-term storage of dry ice, a compact option like the Labasics Lab Dewar Flask with its 350 ml capacity is typically sufficient. However, for more demanding applications such as long-term storage of liquid nitrogen or larger sample volumes, a higher capacity unit becomes necessary. Products like the BMGIANT 2L Liquid Nitrogen Container or the U.S. Solid 3L Liquid Nitrogen Container are specifically designed for LN2, often featuring optimized designs for minimizing evaporation and sometimes including accessories like internal canisters for organized storage. Consider if the Dewar will be used for general cryogen storage or if it requires specialized features for particular liquid gases.
Construction Material and Durability
The construction material significantly impacts a Dewar flask's durability, insulation, and suitability for various environments. Many basic lab Dewar flasks, such as the Labasics model, feature a high borosilicate glass vacuum silvered liner, offering excellent insulation for its size but requiring careful handling due to the inherent fragility of glass. For more rugged laboratory or transport applications, a stainless steel cased Dewar, like the SCILOGEX Wide Mouth DILVAC, provides superior protection against impacts and corrosion. These robust designs, often incorporating double-walled borosilicate glass within a protective metal casing, are well-suited for environments where accidental bumps or drops are a concern, ensuring the integrity of both the flask and its contents.
Insulation Performance and Evaporation Rate
The primary function of a Dewar flask is to maintain extremely low temperatures, making insulation performance a critical buying criterion. High-quality Dewar flasks minimize heat transfer through a vacuum-sealed space, often with silvered surfaces to reflect thermal radiation. While many glass-lined flasks, like those from Labasics, offer good insulation for their design, specialized cryogenic containers often undergo rigorous testing. For instance, U.S. Solid explicitly states they test the evaporation rate of their liquid nitrogen tanks, providing a quantifiable measure of their insulation efficiency. For applications where even minimal cryogen loss is critical, understanding and comparing these performance metrics, rather than just relying on general descriptions, is essential.
Design Features and Portability
Beyond core functionality, specific design features can greatly enhance usability and safety. A wide mouth design, as seen in the SCILOGEX Wide Mouth DILVAC, allows for easier access to contents, simpler cleaning, and potentially reduces coolant use by minimizing exposure time. For transportable applications, features like integrated straps, present on both the BMGIANT and U.S. Solid liquid nitrogen containers, are invaluable for secure handling and mobility. The overall form factor, whether a tall flask like the Labasics or a low-profile design (seen in other products by SCILOGEX), should align with the available space and operational workflow in the laboratory.
Pros & Cons
Labasics Lab Dewar Flask, High Borosilicate Glass Vacuum Silvered Liner, Tall Flask, 350 ml Capacities, Ideal for Dry Ice and Liquid Nitrogen Storage
Pros
- Compact 350 ml capacity suitable for small-volume laboratory tasks.
- High borosilicate glass vacuum silvered liner provides effective insulation.
- Versatile for storing dry ice and conducting low-temperature research.
Cons
- Glass construction, even with an aluminum shell, can be susceptible to breakage.
- Limited capacity may not be suitable for larger experiments or long-term storage.
SCILOGEX Wide Mouth DILVAC Stainless Steel Cased Dewar Flask 4 Liter – for Liquid Nitrogen, Liquified Gases & Dry Ice – Cryogenic Storage Double-Walled Glass with Lid Clamps & Vented Lid
Pros
- Robust stainless steel outer casing offers superior durability and corrosion resistance.
- Wide mouth design facilitates easy access to contents and simplifies cleaning processes.
- Double-walled borosilicate glass construction ensures excellent thermal insulation for various cryogens.
Cons
- The 4-liter capacity may be larger than needed for some minimal-volume applications.
- Weight can be a factor when filled, making transport without handles less convenient.
U.S. Solid 3L Liquid Nitrogen Container LN2 Tank Cryogenic Dewar Semen Flask with Straps 6 Canisters Carry Bag
Pros
- Specifically designed and optimized for liquid nitrogen storage, ensuring specialized performance.
- Includes practical accessories such as 6 canisters and a carry bag for organized transport.
- Evaporation rate testing provides a clear indication of insulation efficiency and cryogen longevity.
Cons
- Specialized focus on LN2 may make it less ideal for general-purpose cryogen storage.
- The inclusion of accessories and specialized design may contribute to a higher initial investment.
Common Mistakes to Avoid
Overlooking Capacity Requirements for Cryogen Volume
A common oversight is selecting a Dewar flask without adequately considering the required volume of cryogen and the duration of storage. For instance, opting for a 350 ml Labasics Lab Dewar Flask might be fine for short-term, small-scale experiments, but it would be insufficient and inefficient for storing larger quantities of liquid nitrogen or for applications requiring extended preservation. Users frequently find themselves needing to refill smaller units more often, which can be time-consuming and lead to increased cryogen consumption.
Disregarding Material Compatibility and Durability Needs
Another frequent mistake involves not matching the Dewar's construction material to the lab environment and intended use. While a high borosilicate glass vacuum silvered liner, as found in the Labasics model, offers excellent insulation, it is inherently more fragile than a stainless steel cased Dewar. Placing a glass-lined flask in a high-traffic area or where it might be subject to physical impact, rather than a more robust option like the SCILOGEX Wide Mouth DILVAC with its stainless steel casing, often leads to premature damage and potential safety hazards.
Neglecting Evaporation Rates for Long-Term Storage
Users sometimes overlook the importance of a Dewar flask's evaporation rate, especially for long-term storage of expensive or critical cryogenic liquids. Products like the U.S. Solid 3L Liquid Nitrogen Container explicitly state their tested evaporation rates, which is a crucial indicator of insulation quality. Choosing a general-purpose Dewar without this specification for sensitive applications can result in significant cryogen loss over time, undermining preservation efforts and increasing operational costs, as the cryogen dissipates faster than anticipated.
Ignoring Portability and Access Features
Failing to consider practical design elements like portability and ease of access can hinder laboratory workflows. For applications requiring frequent movement of cryogens, a Dewar flask without features like straps, as included with the BMGIANT 2L Liquid Nitrogen Container and U.S. Solid units, can be cumbersome and unsafe to transport. Similarly, a narrow-mouth Dewar can make it difficult to retrieve samples or add materials, contrasting with the convenience offered by the wide mouth design of the SCILOGEX DILVAC flask.
