Agent Name

Helium

CAS Number

7440-59-7

Formula

He

Major Category

Toxic Gases & Vapors

Synonyms

Atomic helium; Helium; Helium-4; O-Helium; p-Helium; [ChemIDplus] UN1046; UN1963

Category

Simple Asphyxiants

Description

An inert gas that is colorless and odorless; [ACGIH]

Sources/Uses

Used as an inert gas in arc welding; Also used in balloons, airships, lamps, electronic tubes, and cryogenic applications; [ACGIH] Also used to replace nitrogen in breathing supply of high-pressure divers and as a coolant for nuclear reactors; [Merck Index # 4630] Also used for leak detection, growing crystals (germanium and silicon), transferring heat, and producing lasers; [Hawley]

Comments

Simple asphyxiant; Evaporating liquid can cause frostbite; [ICSC]

Exposure Assessment
Explanatory Notes

No TLV because the concentration of oxygen is the important factor; See Appendix F: Minimal Oxygen Content. [TLVs and BEIs]

Adverse Effects
Other Poison

Simple Asphyxiant

Links to Other NLM Databases
Health Studies

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Toxicity Information

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Chemical Information

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Biomedical References

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Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: