| CAS No.: | 7440-59-7 |
|---|---|
| Formula: | He |
| EINECS: | 231-168-5 |
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Helium is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table.[a] Its boiling point is the lowest among all the elements, and it does not have a melting point at standard pressure. It is the second-lightest and second most abundant element in the observable universe, after hydrogen. It is 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 in both the Sun and Jupiter, because of 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. The most common isotope of helium in the universe is helium-4, the vast majority of which was formed during the Big Bang. Large amounts of new helium are created by nuclear fusion of hydrogen in stars.
Liquid helium is used in cryogenics (its largest single use, consuming about a quarter of production), and in the cooling of superconducting magnets, with its main commercial application 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 crystal to make silicon wafers-account for half of the gas produced. A small but well-known use is as a lifting gas in balloons and airships.[19] 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 (helium I and helium II) is important to researchers studying quantum mechanics (in particular the property of superfluidity) and to those looking at the phenomena, such as superconductivity, produced in matter near absolute zero.
Specification:
| Specification | Company Standard |
| He | ≥ 99.999% |
| N2 | ≤ 2.0 ppm |
| O2+AR | ≤ 1.0 ppm |
| H2 | ≤ 1.0 ppm |
| CO | ≤ 0.5 ppm |
| CO2 | ≤ 0.5 ppm |
| Ne | ≤ 1.0 ppm |
| CH4 | ≤ 0.5 ppm |
| Moisture | ≤ 0.5 ppm |
Q: What's TAIYU main sales products?
A: We mainly supply specialty gases and gas equipments.
Q: What's TAIYU order MOQ?
A: We advice our customer one container at least , anyway we prefer our clients demand.
Q: How long is the delivery time?
A: Normally 30 days after deposit paid.
Q: Which port will you ship?
A: HongKong, QingDao , Shanghai or according to customers' demand.
Q: Can you provide Assurance Trade Order ?
A: Yes if you just purchase empty gas cylinder.
Q: Can we visit Taiyu factory ?
A: Welcome to our factory , we will serve for you best.
Chengdu Taiyu Industrial Gases Co., Ltd
Add:Room 1104, 4th Building, Stage II,Shudu Center Building, High-Tech Zone, Chengdu City, China.
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