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Helium

Helium is a colourless, odourless, nontoxic; nonflammable gas.

Applications
Pure helium is used:

  • in various analytical instrument applications, most commonly as a carrier gas in gas chromatography
  • as a heat transfer material
  • in the manufacturing of calibration mixtures
  • as a component in laser gas mixtures
  • in the semiconductor industry as a carrier/purge gas
  • as a blanket gas to exclude air from certain fabrication processes
  • Helium mixtures with hydrocarbons are used in Geiger counters employed for the detection of a, b, g and X-rays
  • in mixtures with oxygen as a breathing gas.

Materials Compatibility
Metals: Brass; Stainless Steel; Carbon Steel; Aluminum; Zinc; Copper; Monel.
Plastics: Kel-F; PTFE; PVC; Polycarbonate.
Elastomers: Viton; Buna-N; Neoprene.

Technical Properties
Molecular Weight: 4.003
Specific Gravity (Air = 1): 0.14
Odour: None
CAS Registry No.: 7440-59-7