Helium (He)

Helium is the second lightest element. It is a colourless, odourless, and tasteless, inert gas present in dry air at a concentration of 0.0005%. Its principal source is natural gas wells where the Helium is extracted from the crude natural gas stream and purified.

Properties U.S. Units S.I. Units

Chemical formula

He

He

Molecular weight

4.003

4.003

Density of the gas at 70°F(21.1°C) and 1atm.

0.0103 lb/ft3

0.165 kg/m3

Specific gravity of the gas 70°F (21.1°C) and 1 atm (air = 1)

0.138

0.138

Specific volume of the gas 70°F (21.1°C) and 1 atm

97.07 ft3/lb

6.601 m3/kg

Density of the liquid saturated at 70°F (21.1°C)

7.802 lb/ft3

124.98 kg/m3

Critical temperature

-450.3 °F

-267.9 °C

Critical pressure

33.0 psia

227 KPa, abs

Critical density

4.347 lb/ft3

69.64 kg/m3

Boiling point at 10psig (170 kpa abs)

-452.1 °F

-268.9 °C

Solubility in water vol/vol at 32°F(0°C)& 1 atm.

0.0094

0.0094

Industry

Usage

Laboratories and calibration

It is used as carrier in gas chromatography.

Diving

Breathing mixtures for divers.

Health care

As a cooling fluid for MRI, NMR or EPR magnets and breathing mixtures for those with impaired lung functions.

Metal fabrication

Used as a protective atmosphere for arc welding

Electrical

Used for cooling superconducting magnets.

Used in growing crystals to make silicon wafers.

Other

Balloon inflation, electronics industry.

Grade

Cylinder type

Pressure (Barg)

4.5
Purity > 99.995%

50L

200

40L

150

6.0
Purity > 99.9999%

50L

200

40L

150

5.5
Purity > 99.9995%

50L

200

40L

150

5.0
Purity > 99.999%

50L

200

40L

150

 

 

 

 

Specification Grade

Impurities (ppmv)

Certification Specification

H2O

O2

N2

CO + CO2

CnHm

4.5

5

10

5

1

1

*

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