Gas Purity Specifications
|
Parameter Name |
Specification |
|
Gas Purity |
99.999% |
|
Nitrogen |
≤ 2.0 ppm |
|
Oxygen, Argon |
≤ 1.0 ppm |
|
Hydrogen |
≤ 1.0 ppm |
|
Carbon Monoxide |
≤ 0.5 ppm |
|
Carbon Dioxide |
≤ 0.5 ppm |
|
Neon |
≤ 1.0 ppm |
|
Methane |
≤ 0.5 ppm |
|
Moisture |
≤ 0.5 ppm |
Packaging Specifications
Gas packaged in cylinders, cylinder capacity 40L-50L, pressure 150bar-200bar
Usage Precautions
1. Classify and stack properly during transportation and use.
2. Keep away from open flames and heat sources, and avoid direct sunlight exposure.
3. Do not strike, throw, or handle roughly.
4. Avoid contact with oils and waxes.
5. For short-distance movement, use a handcart; for long-distance transport, use specialized vehicles.
6. Wear full protective gear while handling to prevent skin injuries.
7. Conduct regular inspections.
Gas Description
Helium (He) is an inert element with the symbol He and belongs to the noble gases. Under normal conditions, helium is colorless and odorless, and it is the only substance that cannot solidify under standard atmospheric pressure. Helium is mainly used as a protective gas, a working fluid in gas-cooled nuclear reactors, and as a cryogenic refrigerant. Additionally, due to its low density compared to air and its stable properties, helium can also be used as a lifting gas.
Helium is present throughout the universe, accounting for 23% by mass, second only to hydrogen. In nature, it is mainly found in natural gas or radioactive minerals. In Earth's atmosphere, the concentration of helium is extremely low, only 0.052 parts per thousand. Helium in Earth's radioactive minerals is a product of alpha decay. Some natural gases contain helium in quantities that are economically viable for extraction, with concentrations up to 7%. Helium constitutes about 1% of natural gas in the United States, and in surface air, each cubic meter contains 4.6 cubic centimeters of helium, roughly 0.0005% of the total volume. Its density is only 1/7.2 that of air, making it the lowest-density gas aside from hydrogen.
Helium is the least reactive element among all elements and rarely forms compounds due to the small distance between its nucleus and electron shells and its stable structure. This property defines its applications, which mainly include use as a protective gas, a working fluid in gas-cooled nuclear reactors, and a cryogenic refrigerant.
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