Vacuum Insulated Dewar Flask — how a double wall keeps cryogens cold
A vacuum insulated Dewar flask works by separating an inner and outer wall with a high vacuum, which almost eliminates heat transfer by conduction and convection. REAL GAZ supplies vacuum insulated flasks in stainless steel and glass, together with liquid nitrogen, argon and oxygen fills.
Reflective surfaces or multilayer wrap reduce radiation, so a good flask can hold its contents far longer than a plain container.
Reflective surfaces or multilayer wrap reduce radiation, so a good flask can hold its contents far longer than a plain container.
Flask construction is guided by ISO 21029-1 and EN 13458, with terminology per ISO 10286 and material selection under EN 1252-1.
🏭 Where Vacuum Insulated Dewar Flasks Are Used
- ⚙️ Medical sample storage — vacuum insulated flasks hold frozen specimens at low temperature between laboratory visits;
- 🔬 Food technology — liquid nitrogen in a flask supports quick-freezing of test batches and ice-cream demonstrations;
- 🏥 Electronics repair — cooling components helps trace thermal faults during diagnostics;
- 🚀 Outdoor field work — insulated flasks move cryogens to sites with no electricity or pipelines.
💡 Why Choose REAL GAZ
- ✅ Strong insulation — high vacuum and radiation shielding cut heat ingress sharply;
- 🧪 Material options — stainless steel for toughness and glass for visibility and chemical resistance;
- 🎯 Clear care guidance — we explain how to avoid vacuum loss from knocks and thermal shock;
- 🔒 Flexible supply — buy flasks, refills or both under one agreement.
- 📄 Certificate of Analysis (CoA) — supplied with every order.
📦 Handling & Storage of Vacuum Insulated Dewar Flasks
- Look for condensation or frost on the outer wall, which signals vacuum loss.
- Keep the vent open when the flask contains liquid.
- Transport flasks upright, braced against movement.
- Compare stainless steel and glass flasks: steel withstands knocks, while glass lets you watch the liquid but needs a protective housing.
- Avoid scratching the inner wall of a glass flask, since surface defects can lead to failure under temperature cycling.
- Allow a flask to warm to room temperature naturally after emptying, and never use hot water to speed it up.
- Keep a log of top-up dates to estimate daily loss and notice if insulation performance changes.
🔬 Quality Control & Safety
- vacuum jacket leak test;
- thermal performance verification;
- inspection of inner and outer wall surfaces;
- checks of stopper, vent and handle components.
Filled flasks follow ADR / UN carriage rules and are labelled for their cryogen.
⚙️ Trusted Gas Solutions
In Azerbaijan, Turkey, Georgia, Uzbekistan and the USA, REAL GAZ helps buyers find the right vacuum insulated Dewar flask for sample storage, laboratory work and industrial tasks. Call us for a recommendation and a refill plan.
REAL GAZ — vacuum that works, cold that lasts.