Liquid Helium Gas Cylinder — choosing between liquid dewars and compressed gas cylinders
A Liquid Helium Gas Cylinder is a phrase customers use for two different products, and REAL GAZ supplies both. Liquid helium travels in vacuum-insulated dewars at around 4.2 K; helium gas travels in steel or composite cylinders at 200 or 300 bar.
We help you pick the format that suits your equipment and avoid paying for cold you do not need.
We help you pick the format that suits your equipment and avoid paying for cold you do not need.
Dewars follow ISO 21029 and EN 13458; gas cylinders follow ISO 9809, EN 1964 and TPED, covering cryogenic and gas-phase use.
If your system needs liquid, for instance to fill a cryostat or magnet, a dewar is the right container. If you need helium gas for chromatography, leak testing, welding purge or balloon applications, a pressurised cylinder is simpler and more economical. Helium gas in cylinders is available in technical, 5.0 and 6.0 grades, with valve outlets chosen to match your regulators. Our team will confirm connections before dispatch.
A common misunderstanding is that a high-pressure cylinder can hold liquid helium. It cannot: helium has a critical temperature of about 5.2 K, so at room temperature it is always a gas. A 50 L cylinder at 200 bar holds roughly 9–10 cubic metres of gas, which is useful, but it is not a substitute for liquid when you need cooling.
🏭 Where Helium Is Used
- ❄️ Cryostat filling — Liquid helium dewars supply magnets, detectors and dilution refrigerators with liquid at 4.2 K;
- 🧪 Gas chromatography — High-purity helium cylinders provide carrier gas for analytical laboratories;
- 🔍 Leak detection — Helium gas from cylinders is used with mass spectrometer leak detectors on production lines;
- 🔧 Purging and inerting — Technical helium cylinders support welding backing, purge and special atmospheres.
💡 Why Choose REAL GAZ
- ✅ Correct format — we explain when liquid or gas is the better choice;
- 🧪 Grade choice — technical to ultra-high purity helium grades are available;
- 🎯 Matched fittings — valves and regulators suit your equipment;
- 🔒 Tested containers — cylinders and dewars are inspected before every fill;
- 📄 Certificate of Analysis (CoA) — supplied with every order.
🔬 Quality Control & Safety
- purification and drying of helium;
- moisture and impurity analysis;
- cylinder inspection and hydraulic test status check;
- leak and pressure integrity testing.
Gas cylinders are marked and transported as ADR / UN 1046; liquid dewars as UN 1963, with valves to relevant EN ISO standards.
⚙️ Trusted Gas Solutions
REAL GAZ clarifies the Liquid Helium Gas Cylinder question for customers in Azerbaijan, Turkey, Georgia, Uzbekistan and the USA, then supplies the correct container with a CoA. Tell us your application and we will recommend liquid, gas or a combination.
REAL GAZ — the right helium in the right container.