Helium
CAS 7440-59-7
EC 231-168-5
Formula He
MW 4 g/mol
Home Care & Industrial CleaningElectronicsBiotechnology & Life SciencesAerospace & Defense Solvent & Carrier
Description
Helium (CAS 7440-59-7, EC 231-168-5, formula He) is a noble gas and the second lightest element, also referred to as helium-4 in its most abundant natural isotope form. It carries no E-code classification and is not subject to food additive regulation. It is commercially distributed as a compressed or liquefied gas.
In electronics manufacturing, helium serves as an inert carrier gas during semiconductor fabrication, preventing oxidation in controlled atmospheres. In biotechnology and life sciences, it functions as a carrier gas in gas chromatography, transporting analyte molecules through the column due to its low viscosity and chemical inertness. In aerospace, it pressurizes fuel systems and purges rocket propellant lines.
Helium is supplied in industrial, scientific, and high-purity grades, with purity levels reaching 99.9999% for analytical applications. It is subject to REACH regulation within the EU. Standard packaging includes high-pressure cylinders, tube trailers, and liquid dewars depending on volume requirements.
In electronics manufacturing, helium serves as an inert carrier gas during semiconductor fabrication, preventing oxidation in controlled atmospheres. In biotechnology and life sciences, it functions as a carrier gas in gas chromatography, transporting analyte molecules through the column due to its low viscosity and chemical inertness. In aerospace, it pressurizes fuel systems and purges rocket propellant lines.
Helium is supplied in industrial, scientific, and high-purity grades, with purity levels reaching 99.9999% for analytical applications. It is subject to REACH regulation within the EU. Standard packaging includes high-pressure cylinders, tube trailers, and liquid dewars depending on volume requirements.
Physical Properties
| Melting Point | -272.2 °C |
| Boiling Point | -268.9 °C |
| Density | 1.625 x 10⁻⁴ g/cm³ (gas) |
| Appearance | Helium is a colorless, odorless, and tasteless gas. It is nonflammable. |
| Color | colorless |
| Odor | at 100.00?%. odorless |
| Form | gas |
| Water Solubility | 8.61mL/1000g H2O (101.32kPa, 0°C) [KIR78]; Henry’s law constants, k×10?4: 9.856 (104°C), 6.739 (149.4°C), 2.524 (250.6°C), 1.796 (275.1°C) [POT78] |
| Log P | 0.280 |
Trade & Regulatory
| UN Number | 1046 |
| ADR Class | 2.2 |
| Storage Class | 2A - Gases |
| WGK (Germany) | 3 |
Other Names
element 2p-Heliumo-HeliumHelium-4heliumgasatomicheliumAtomic heliumHYDROGEN-HELIUM
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Raw Materials
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