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Helium - ( He )
Helium is a colorless, odorless, nontoxic, nonflammable gas that is lighter than air. It is shipped in steel cylinders under high pressure.
| Specifications | |||
| Purity , % | 99.999 | 99.9999 | 99.99999 |
| Oxygen | ≤1.0 ppmv | ≤50 ppbv | ≤10 ppbv |
| Nitrogen | ≤2.0 ppmv | ≤500 ppbv | ≤50 ppbv |
| Carbon Dioxide | ≤0.5 ppmv | ≤100 ppbv | |
| Carbon Monoxide | ≤0.5 ppmv | ≤50 ppbv | |
| Carbon Dioxide+Carbon Monoxide | ≤5 ppbv | ||
| Methane | ≤0.5 ppmv | ≤100 ppbv | ≤5 ppbv |
| Water | ≤3.0 ppmv | ≤200 ppbv | ≤100 ppbv |
| Hydrogen | ≤1.0 ppmv | ≤10 ppbv | |
| Neon | ≤4.0 ppmv | ≤15 ppbv | |
| Ship | |||
| DOT Shipping Name | Helium , Compressed | ||
| DOT Classification | 2.2 | ||
| DOT Label | Non-flammable Gas | ||
| UN Number | UN 1046 | ||
| CAS No. | 7440-59-7 | ||
| CGA/DISS/JIS/BS341/DIN477 | 580/718/W21-14L/NO.3/NO.6 | ||
| Shipped as | Compressed Gas | ||
| Technical Information | |||
| Cylinder State @ 21.1°C | Gas | ||
| Flammable Limits In Air | Non-flammable | ||
| Auto Ignition Temperature (°C ) | ’- | ||
| Molecular Weight (g/mol) | 4.0026 | ||
| Specific gravity (air =1) | 0.138 | ||
| Critical Temperature ( °C ) | -267.95 | ||
| Critical Pressure ( psig ) | 18.29 | ||
| Applications | |||
|
· In various analytical instrument applications, most commonly as a carrier gas in gas chromatography · As a heat transfer material · In the manufacturing of calibration mixtures · As a component in laser gas mixtures · In the semiconductor industry as a carrier/purge gas · Helium mixtures with hydrocarbons are used in Geiger counters employed for the detection of a, b, g and X-rays · In mixtures with oxygen as a breathing gas. | |||