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Hydrogen - H2
Hydrogen is a flammable, colorless, odorless, nontoxic gas that is lighter than air. It is shipped in steel cylinders under high pressure.
| Specifications | ||
| Purity , % | 99.999 | 99.9999 |
| Oxygen | ≤1.0 ppmv | ≤0.05 ppmv |
| Nitrogen | ≤5.0 ppmv | ≤0.2 ppmv |
| Carbon Dioxide | ≤1.0 ppmv | ≤0.02 ppmv |
| Carbon Monoxide | ≤1.0 ppmv | ≤0.02 ppmv |
| Methane | ≤1.0 ppmv | ≤0.01 ppmv |
| Water | ≤3.0 ppmv | ≤0.5 ppmv |
| Ship | ||
| DOT Shipping Name | Hydrogen , Compressed | |
| DOT Classification | 2.1 | |
| DOT Label | Flammable Gas | |
| UN Number | UN 1049 | |
| CAS No. | 133-74-0 | |
| CGA/DISS/JIS/BS341/DIN477 | 350/724/W22-14L/NO.4/NO.1 | |
| Shipped as | Compressed Gas | |
| Technical Information | ||
| Cylinder State @ 21.1°C | Gas | |
| Flammable Limits In Air | 4–74.5 % | |
| Auto Ignition Temperature (°C ) | 475 | |
| Molecular Weight (g/mol) | 2.016 | |
| Specific gravity (air =1) | 0.071 | |
| Critical Temperature ( °C ) | -239.97 | |
| Critical Pressure ( psig ) | 372.785 | |
| Applications | ||
| · In various analytical instrument applications, most commonly as a fuel component of combustion gases for Flame Ionization and Flame Photometric Detectors · As a carrier gas in gas chromatography · In mixtures for heat treatment in metallurgy · In mixtures for laser applications · In mixtures for leak detection · In hydrogenation processes · In manufacturing of calibration mixtures · In semiconductor fabrication: carrier gas, especially for silicon deposition. | ||