TECHNICAL GAS HOSE ISO 3821 — blue and black hose for inert and oxidising gases
The Technical Gas Hose ISO 3821 from REAL GAZ carries non-flammable technical gases such as oxygen, argon, nitrogen and compressed air.
Oxygen hose is blue and inert gas hose is often black, and both are made with an inner tube that is free of oil and rated for the working pressure.
Oxygen hose is blue and inert gas hose is often black, and both are made with an inner tube that is free of oil and rated for the working pressure.
REAL GAZ supplies this product according to ISO 3821, EN 559 and EN ISO 14175 shielding gases, for welding and process lines.
🏭 Where ISO 3821 Technical Gas Hoses Are Used
- 🛠️ MIG and TIG welding — argon and Ar/CO₂ are carried to the torch;
- 🔬 Laboratories — nitrogen, helium and compressed air reach instruments through flexible lines;
- 🏭 Oxy-fuel cutting — a blue oxygen hose supplies the cutting jet;
- 🥬 Food packaging — nitrogen is routed to modified-atmosphere equipment.
💡 Why Choose REAL GAZ
- ✅ Oxygen-clean production — inner tubes are handled to avoid contamination;
- 🧪 Compatible compounds — tube materials suit oxygen and inert gases;
- 🎯 Colour coding — blue for oxygen and black for inert gas lowers the risk of errors;
- 🔒 Working pressure rating — each hose is marked for safe use;
- 📄 Certificate of Analysis (CoA) — supplied with every order.
📐 Selection Guide
- pick blue for oxygen and black for inert or air, as required locally;
- keep oxygen hose away from oil and grease;
- choose antistatic variants only where specified.
📦 Supply and Handling
We keep blue oxygen hose and black inert-gas hose in the most common bores, and both are packed in clean film to protect the bore from dust. Hose for oxygen service is cut and assembled in a clean area, and can be capped at both ends before shipping. Customers using argon or Ar/CO₂ for MIG and TIG can specify hose with an antistatic or UV-stable cover for outdoor lines. Our team can match the hose to regulators, flowmeters and torch connections, and can offer assemblies with quick couplings for frequent changes. For shielding gas, hose length and bore influence flow stability at the torch, so give us the flow rate in litres per minute and the distance from regulator to torch, and we will suggest a suitable bore. Spare couplings and clamps are available in the same delivery.
🔬 Quality Control & Safety
- inner bore cleanliness check;
- hydrostatic testing on samples;
- bend and kink resistance review;
- leak testing and pressure integrity checks.
Never use a fuel gas hose for oxygen, or the reverse, and replace any hose that has seen oil contact. Products and cylinders comply with ADR / UN transport rules and relevant EN/ISO standards.
⚙️ Trusted Gas Solutions
REAL GAZ supplies ISO 3821 Technical Gas Hoses to welders, laboratories and manufacturers in Azerbaijan, Turkey, Georgia, Uzbekistan and the USA. The REAL GAZ team can supply technical gas hose ISO 3821 by the metre or as assemblies.
REAL GAZ — Clean lines for every gas.