Helium - Airgas.com

Medical Gases

Helium

Helium (He) U.S.P.

Cylinder Color: Brown

He- A colorless, odorless, nonflammable gas is only one-seventh as heavy as air. Helium is inert chemically and pharmacologically and can act as a simple asphyxiant by displacing air.

Major Hazards: High Pressure and Suffocation

Exposure Limit: Simple Asphyxiant (ACGIH 1995-96)

Fire Potential: Nonflammable

Odor: None

Mol. Wt.: 4.003

Sp. Gr. (Air = 1) 70° F (21° C): 0.138

Critical Temperature: -450.3° F (-268° C)

Critical Pressure: 33.22 psia (2.3 kg/cm²abs)

Specific Volume: 96.7 ft³/lb at 70° F (5.90 m³/kg at 15° C)

CAS Registry No.: 7440-59-7

D.O.T. Description: Helium, Compressed, 2.2, UN1046

Medical Applications: As a component of breathing mixtures, to reduce the density of the mixture, and thus facilitate breathing under certain physical and physiological conditions.

Valve Connection	Cylinder Size	Contents	Pressure PSIG @70°F	Nominal Gross Wt.
CGA 580 (Threaded)	200	218ft³6.04m³	2,200psig 154.7kg/cm²	146lb 66.4kg
CGA 580 (Threaded)	190	194ft³5.38m³	2,200psig 154.7kg/cm²	135lb 61.2kg
CGA 930 (Pin-Indexed)	ME	22.0ft³0.61m³	2,015psig 141.7kg/cm²	14.8lb 6.71kg
CGA 930 (Pin-Indexed)	ED	18.3ft³0.51m³	2,200psig 154.7kg/cm²	12.6lb 5.72kg
CGA 930 (Pin-Indexed)	MD	13.5ft³0.37m³	2,015psig 141.7kg/cm²	9.7lb 4.4kg

Purity Specifications
U.S.P. 99.0% He, min.
CO < 10 ppm
Odor None detected

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