Liquid Oxygen, Nitrogen, Helium Dewar Flasks — each cryogen paired with the correct flask
Choosing between liquid oxygen, nitrogen, helium Dewar flasks is more than a question of size, because each cryogen demands different materials and insulation. REAL GAZ supplies flasks specified per liquid: oxygen-cleaned units, standard nitrogen flasks and high-performance helium transport Dewars.
We advise on the flask, the stopper and the transfer method so that every liquid is handled correctly.
We advise on the flask, the stopper and the transfer method so that every liquid is handled correctly.
Oxygen service uses cleaning per EN 12300; construction references ISO 21029-1; material choices follow EN 1252-1 toughness rules for low temperature.
🏭 Where Cryogenic Dewar Flasks Are Used
- ⚙️ Oxygen transfers — small volumes of liquid oxygen support research on combustion and breathing-system testing in controlled laboratories;
- 🔬 Nitrogen storage — liquid nitrogen flasks serve cryopreservation, sample transport and food laboratory work;
- 🏥 Helium transport — high-efficiency flasks move liquid helium to magnets and low-temperature physics setups;
- 🚀 Educational labs — instructors use separate flasks for each cryogen to show boiling points and gas expansion.
💡 Why Choose REAL GAZ
- ✅ Correct design per liquid — helium flasks include extra shielding because of its very low latent heat;
- 🧪 Oxygen-safe preparation — flasks for oxygen are cleaned and kept away from hydrocarbons;
- 🎯 Reduced boil-off — good vacuum and neck design limit costly helium and nitrogen losses;
- 🔒 Expert guidance — our team explains transfer tubes, siphons and pressure-relief practice.
- 📄 Certificate of Analysis (CoA) — supplied with every order.
📦 Handling & Storage of Cryogenic Dewar Flasks
- Never use a nitrogen flask for oxygen without documented cleaning.
- Pre-cool helium transfer lines to cut evaporation losses.
- Allow for ventilation, because boil-off gas displaces room air.
- Label each flask permanently with its gas; accidental use of an oxygen flask for hydrocarbons or oils can cause fire.
- Use a closed-circuit transfer for helium, where possible, because open pouring evaporates large quantities.
- Choose narrow-neck designs for helium and nitrogen when hold time matters more than quick access.
- Never store flasks in sealed cupboards, since evaporating gas must have a path to the open air.
🔬 Quality Control & Safety
- dedicated flasks per gas to prevent contamination;
- vacuum level and evaporation rate tests;
- oxygen cleanliness inspection;
- neck, stopper and handle integrity check.
Transport meets ADR / UN, and each flask is labelled for its specific cryogen.
⚙️ Trusted Gas Solutions
REAL GAZ supplies liquid oxygen, nitrogen, helium Dewar flasks and the matching liquids to customers in Azerbaijan, Turkey, Georgia, Uzbekistan and the USA. Our experts will help you assign the right flask to each cryogen and keep a safe, tidy store.
REAL GAZ — every cryogen in its own correct vessel.