Dewar Flask
Dewar Flask
Features
- Double-Walled Design
- Vacuum Insulation
- Silvered Inner Surface
- Low Heat Conduction
- Cryogenic Storage
- Size and Configuration
- Thermal Insulation
- Gas Management
Specifications and Details of Dewar Flask
A Dewar Flask is a specialized glass container used to maintain the temperature of liquids. It maintains the temperature of the stored liquid in the surrounding air by minimizing heat transfer. It uses a double-wall structure to create a strong vacuum to reduce convection and conduction heat transfer. The flask has silver-coated inner walls to block heat radiation and minimize contact points between the walls. This ensures that it has high thermal insulation.
It is often used for cryogenic storage, also known as cryogenic storage dewar. It is a dedicated vacuum flask that safely stores cryogenic materials with extremely low boiling points, such as liquid nitrogen or helium. This container is named after inventor James Dewar. It is widely utilized in low-temperature physics and chemistry applications. It comes in various sizes and forms, like open buckets, flasks with loosely fitted stoppers, and self-pressurizing tanks.
How this works?
The common thread among all dewars is its multi-layered wall design. It comes with a high vacuum in between and provides exceptional thermal insulation to slow the evaporation of cryogenic contents. Stringent safety measures are incorporated into the design of dewars to handle the gas released as cryogenic liquid boils away safely. It is essential for preserving ultra-cold substances for scientific, industrial, and laboratory applications. Its straightforward design and remarkable insulation properties make it invaluable in research and experimentation.
Temperature Range
- Glass Dewar: -50 °C to -150 °C
- Borosilicate Glass: 150 °C to -270 °C
- Cryogenic Dewar Flask: -160 °C to -200 °C
- Stainless Steel: -190 °C to 200 °C
Main Highlights
- Double-Walled Design: A Dewar Flask features a double-walled structure with an inner and outer wall. These walls are separated to minimize heat transfer.
- Vacuum Insulation: The space between the two walls is meticulously evacuated to create a high vacuum. This vacuum greatly reduces heat transfer through convection and conduction.
- Silvered Inner Surface: The inner surfaces of the walls are coated with a layer of silver to block heat transfer by radiation.
- Low Heat Conduction: The contact points between the two walls are kept to a minimum to reduce heat conduction further.
- Cryogenic Storage: It is specifically designed for cryogenic storage. It can maintain extremely low temperatures, ideal for liquid nitrogen or helium.
- Size and Configuration: It comes in various sizes and configurations, including open buckets, flasks with loose stoppers, and self-pressurizing tanks.
- Thermal Insulation: The multiple layers in the walls, with a maintained high vacuum, provide excellent thermal insulation, reducing the rate at which the stored contents evaporate.
- Gas Management: Precautions are taken in the design of the flask to safely manage the gas released as the cryogenic liquid slowly boils away.
Applications of Dewar Flask
Cryogenic Storage Dewar Flasks find a wide range of applications across various fields. It is mainly known for its role in cryogenic applications. It is specially used to store and dispense cryogenic gases such as liquid nitrogen, oxygen, helium, and hydrogen. It is essential for flash-freezing samples in research laboratories, making it an invaluable tool for scientific experiments. Vacuum Flask, a type of Dewar Vessel, has domestic uses. It maintains the temperature of beverages and food, keeping them hot or cold for extended durations.
It also plays a role in the oil and gas industry, insulating electronic components within wireline logging tools. It is also used in the medical industry during fertility treatments to store embryos safely. In scientific research, the flask is crucial for studying superconductivity. It even facilitates the safe transport of cryogenic liquids within factories or labs through portable Dewars equipped with casters and handles. It is a versatile tool for storing and transporting low-temperature liquid gases and high-temperature liquids, making them essential across many industries and scientific endeavors.
How to use dewar flask ?
- Choose the appropriate Dewar Flask based on your needs, considering capacity, materials, and temperature requirements.
- Fill it with the intended liquid or gas to be stored, ensuring it’s the cryogenic liquid for applications involving liquid nitrogen, oxygen, helium, or hydrogen.
- Seal the Flask with the stopper or cap, venting the stopper in cryogenic applications to prevent pressure buildup.
- Handle it carefully, especially when filled with cryogenic liquids, as it is delicate and prone to breakage.
- Dispense cryogenic liquids slowly and safely using the Flask to ensure a two-handed grip for controlled liquid nitrogen release.
Technical Specification
| Product Name | Dewar Flask |
| Product Type | Vacuum-Insulated Dewar Flask / Cryogenic Storage Flask |
| SKU | TI-Dewarflask |
| Construction | Double-Walled Design |
| Insulation Method | High-Vacuum Insulation Between Inner and Outer Walls |
| Inner Surface | Silver-Coated / Silvered Inner Surface |
| Heat Transfer Reduction | Minimizes Heat Transfer by Conduction, Convection and Radiation |
| Thermal Insulation | Excellent |
| Heat Conduction | Low |
| Available Capacities | 250 mL, 0.5 L, 1 L, 1.5 L, 2 L and 5 L |
| Glass Dewar Temperature Range | -150°C to -50°C |
| Borosilicate Glass Temperature Range | -270°C to 150°C |
| Cryogenic Dewar Flask Temperature Range | -200°C to -160°C |
| Stainless Steel Temperature Range | -190°C to 200°C |
| Configuration Options | Open Bucket, Loose-Stopper Flask and Self-Pressurizing Tank Configurations |
| Cryogenic Storage | Suitable for Cryogenic Storage Applications |
| Compatible Cryogenic Materials | Liquid Nitrogen, Liquid Oxygen, Helium and Hydrogen, Subject to Vessel Compatibility |
| Gas Management | Designed to Safely Manage Gas Released During Cryogenic Liquid Boil-Off |
| Evaporation Control | High Thermal Insulation Helps Reduce Evaporation Rate |
| Temperature Retention | Excellent |
| Low-Temperature Research | Suitable |
| Flash-Freezing Applications | Suitable |
| Laboratory Applications | Cryogenics, Low-Temperature Physics, Chemistry and Scientific Research |
| Industrial Applications | Cryogenic Storage, Transport and Low-Temperature Industrial Processes |
| Medical Applications | Suitable for Application-Specific Cryogenic Storage Research |
| Other Applications | Superconductivity Research, Oil & Gas Equipment and Thermal Insulation Applications |
| Handling | Handle Carefully and Keep the Flask Upright During Cryogenic Use |
| Recommended Cryogenic Handling | Use Appropriate Venting, Protective Equipment and Adequate Ventilation |
| Storage / Transport | Follow Manufacturer Guidelines for the Specific Cryogenic Vessel and Stored Material |
| Customization | Available for Specific Research and Industrial Requirements |
Why Choose Dewar Flask?
A Dewar Flask is designed to minimize heat transfer and maintain the temperature of stored liquids for extended periods. Its double-walled construction, vacuum insulation and silvered inner surface provide effective thermal insulation, making it suitable for cryogenic storage, low-temperature research, laboratory applications and industrial handling of temperature-sensitive materials.
- Double-Walled Construction:
The inner and outer walls are separated to significantly reduce heat transfer between the stored material and the surrounding environment. - High-Vacuum Insulation:
The evacuated space between the walls minimizes heat transfer through conduction and convection, helping maintain stable temperatures. - Silvered Inner Surface:
The reflective inner surface reduces heat transfer by radiation, improving the overall thermal insulation performance. - Designed for Cryogenic Storage:
Suitable for storing and handling cryogenic materials such as liquid nitrogen and helium when used with an appropriate vessel configuration. - Excellent Temperature Retention:
The multi-layered vacuum-insulated construction helps slow temperature changes and reduces evaporation of cryogenic liquids. - Wide Capacity Selection:
Available in 250 mL, 0.5 L, 1 L, 1.5 L, 2 L and 5 L capacities for different laboratory and research requirements. - Wide Temperature Capability:
Different Dewar configurations and materials support applications ranging from cryogenic temperatures to elevated-temperature applications. - Suitable for Low-Temperature Research:
Useful for cryogenics, low-temperature physics, chemistry, superconductivity research and experimental laboratories. - Useful for Flash-Freezing:
The thermal insulation properties make Dewar flasks suitable for laboratory procedures involving rapid cooling and cryogenic sample handling. - Gas Management:
The design accounts for gas released as cryogenic liquids boil, helping support safer handling when the correct venting and vessel configuration are used. - Multiple Configurations:
Dewar vessels are available in configurations such as open buckets, loose-stopper flasks and self-pressurizing systems according to application requirements. - Versatile Laboratory and Industrial Use:
Suitable for research laboratories, medical research, oil and gas applications, cryogenic transport and other temperature-control applications. - Research and Industrial Supply:
Techinstro offers Dewar Flasks for research and industrial requirements with different capacities and customized solutions.
Comparison
| Comparison Parameter | Dewar Flask | Standard Laboratory Flask | Vacuum Insulated Flask | Cryogenic Storage Dewar |
|---|---|---|---|---|
| Primary Purpose | Maintaining temperatures by minimizing heat transfer | Holding, mixing, and handling laboratory liquids | Maintaining the temperature of liquids or other contents | Storing and handling specified cryogenic liquids |
| Construction | Typically double-walled with a vacuum-insulated gap | Generally a single-wall glass or other laboratory vessel | Usually double-walled with vacuum insulation | Designed for cryogenic storage, with construction depending on the model |
| Thermal Insulation | High thermal insulation through reduced heat transfer | Limited insulation unless specifically designed otherwise | Good thermal insulation for its intended application | Designed to limit heat ingress during cryogenic storage |
| Heat Transfer Control | Vacuum insulation and, where fitted, a reflective inner surface help reduce heat transfer | No vacuum insulation in a conventional design | Vacuum insulation reduces heat transfer | Depends on the insulation system and vessel design |
| Temperature Capability | Depends on the material and specific model | Depends on the vessel material and laboratory rating | Depends on the manufacturer’s specifications | Specified for the intended cryogenic operating conditions |
| Cryogenic Applications | Suitable only when the model is rated for the intended cryogen | Generally unsuitable for cryogenic storage unless specifically designed for it | Not automatically suitable for cryogenic liquids | Suitable when the vessel is rated for the particular cryogen and use |
| Common Applications | Low-temperature experiments, laboratory research, and temperature-sensitive storage | Sample preparation, mixing, and routine laboratory work | Temperature retention for its intended contents | Cryogenic storage, laboratory research, and approved cryogen handling |
| Capacity Options | Available in different capacities depending on the model | Available in various laboratory sizes | Available in multiple sizes | Capacity depends on the storage vessel and application |
| Selection Considerations | Check capacity, construction material, temperature rating, and intended use | Check chemical compatibility and temperature limits | Check intended contents and manufacturer’s rating | Check cryogen compatibility, venting, pressure limits, and handling requirements |
Safety Guidelines
- Use a small flask or a transfer device for larger containers to handle liquid safely.
- Prevent combustion risks by avoiding liquid air or oxygen in a Dewar Flask designed for nitrogen.
- Ensure compliance with the manufacturer’s guidelines for cryogenic vessels.
- Do not transport liquid nitrogen in passenger elevators.
- Avoid causing breakage by not moving or bending the copper fill tube of a flask.
- Those filling flasks should wear protective gear and maintain well-ventilated storage.
- Keep it upright to prevent liquid discharge and frostbite.
- Prevent frostbite by avoiding skin contact with liquid gas during use.
- When handling it, always use the provided handles, not the neck.
- Securely store cryogenic liquid vessels to prevent unauthorized access.
- Prohibit smoking, flames, or sparks in areas with flammable cryogenic liquids.
- Plan safe transport routes and use elevators without personnel inside to avoid oxygen displacement risks from potential spills.
Why us?
Techinstro is an experienced, well-equipped manufacturer and supplier of superior-quality Dewar Flask. Our Dewar Flask can be conveniently used for research and industrial purposes. We believe in staying ahead of time by employing technological innovations and the best quality raw materials in manufacturing the highest-grade products. We provide high-quality flasks at the most affordable prices. Our clients are our most valued asset, and we keep them satisfied by providing world-class customer service and after-sales service.
We can deliver anywhere globally, so call us now for a customized solution.
FAQ's
It stores cryogenic liquids and temperature-sensitive materials while minimizing heat transfer.
It has double walls with a high vacuum between them to block heat flow.
The silver coating reflects heat radiation and improves insulation.
It comes in 250 mL, 0.5 L, 1 L, 1.5 L, 2 L, and 5 L sizes.
We offer glass, borosilicate glass, stainless steel, and a dedicated cryogenic model.
Borosilicate -270°C to 150°C, glass -150°C to -50°C, cryogenic -200°C to -160°C, stainless steel -190°C to 200°C.
It is offered as an open bucket, a loose-stopper flask, or a self-pressurizing tank.
It holds liquid nitrogen, liquid oxygen, helium, and hydrogen when the vessel is rated for them.
Yes, its strong insulation slows down boil-off of the stored liquid.
Yes, it is used in cryogenics, low-temperature physics, chemistry, and flash-freezing work.
Yes, portable versions with handles and casters move liquids safely within labs and plants.
Keep it upright, hold it by the handles, and use it in a well-ventilated area.
Yes, we customize it for specific research and industrial requirements.