Formula: He
or R704
Helium is a colorless, odorless noble gas. It is shipped as a compressed gas.
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Applications
Applications of helium include the following:
- Helium is used in the welding industry as an inert shielding gas for arc welding
- In the cryogenics field
- In mixtures with neon and argon for electronic tubes and neon signs
- Used in large balloons for upper atmosphere and cosmic ray studies and in small balloons by weather forecasters to carry meteorological instruments
- Used in the missile industry to pressurize rocket fuels and force them into rocket engines
- Used in laboratory and research operations as a leak detector, in “dry boxes”, as a temperature standard, as a carrier in gas chromatography, etc.
- Mixture of helium and oxygen is used as a breathing gas for divers who work under high pressures
| Grade 5 | Grade 6 | |
|---|---|---|
| Purity | 99.999% | 99.9999% |
| Nitrogen | < 3 ppmv | < 400 ppbv |
| Oxygen | < 2 ppmv | < 50 ppbv |
| Carbon Dioxide | < 1 ppmv | < 100 ppbv |
| Carbon Monoxide | < 1 ppmv | < 50 ppbv |
| Methane | < 1 ppmv | < 100 ppbv |
| Water | < 3 ppmv | < 200 ppbv |
| Chemical & Physical Properties | |
| Molecular Weight | 4.00 |
| Sp. Volume | 97.1 cu.ft/lb |
| Pressure @ 70°F | 2000-2490 |
| Valve Outlet | CGA 580 DISS 718 |
| Shipping Information | |
| DOT Name | Helium, Compressed |
| Hazard Class | 2.2 |
| DOT No. | UN 1046 |
| DOT Label | Non-Flammable Gas |
| CAS No. | 7440-59-7 |
| Cylinder Size | Fill Volume (CF) |
| Size 300 | 292 |
*This gas not available for purchase online.
