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UN1046 Helium High Purity Gases He Gas Controlled Atmospheres
Helium is a chemical element with symbol He and atomic number 2.
Helium is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. The He boiling and melting points are the lowest among all the elements.
Helium is the second lightest element and is the second most abundant element in the observable universe, being present at about 24% of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined.
Its abundance is similar to this figure in theSun and in Jupiter. This is due to the very high nuclear binding energy (per nucleon) of helium-4 with respect to the next three elements after helium. This helium-4 binding energy also accounts for why it is a product of both nuclear fusion and radioactive decay. Most helium in the universe is helium-4, and is believed to have been formed during the Big Bang. Large amounts of new helium are being created by nuclear fusion of hydrogen in stars.
Liquid helium is used in cryogenics, particularly in the cooling of superconducting magnets, with the main commercial application being in MRI scanners. Helium's other industrial uses—as a pressurizing and purge gas, as a protective atmosphere for arc welding and in processes such as growing crystals to make silicon wafers—account for half of the gas produced. A well-known but minor use is as a lifting gas in balloons and airships. As with any gas whose density differs from that of air, inhaling a small volume of helium temporarily changes the timbre and quality of the human voice. In scientific research, the behavior of the two fluid phases of helium-4 is important to researchers studying quantum mechanics and to those looking at the phenomena, such as superconductivity, produced in matter near absolute zero.
1. Physical properties
|High purity helium gas
|Hazardous class for transort
2. Typical technical data (COA)
Helium % ≥
|Ne ppm ≤
|H2 ppm ≤
|O2 ppm ≤
|N2 ppm ≤
|CO ppm ≤
|CO2 ppm ≤
|CH4 ppm ≤
|H2O ppm ≤
|According to the valve type
|According to the valve type
|Other sizes are also available
|protective gas in growing silicon and germanium crystals, in titanium andzirconium production, and in gas chromatography
|Gas tungsten arc welding
One industrial application for helium is leak detection. Because helium diffuses through solids three times faster than air, it is used as a tracer gas to detect leaks in high-vacuum equipment and
Airships and balloons are inflated with helium for lift.
Another minor use is in rocketry, where helium is used as an ullage medium to displace fuel and oxidizers in storage tanks and to condense hydrogen and oxygen to make rocket fuel
|Minor commercial and recreational uses
|Helium as a breathing gas has no narcotic properties, so helium mixtures such as trimix, heliox and heliair are used for deep diving to reduce the effects of narcosis
|The use of helium reduces the distorting effects of Temperature variations in the space between lenses in some telescopes,due to its extremely low index of refraction.