Hydrogen (H2)

Hydrogen is the lightest of all gases, colourless, highly flammable and only found in trace quantities in the atmosphere. It issynthesized from hydrocarbons (petroleum and petroleum by-products) and from water where it constitutes the lightest fraction of the H₂O molecule. Major uses of hydrogen include the production of synthetic ammonia and methanol, petroleum refining, the hydrogenation of organic materials, oxyhydrogen torches, and in rocket fuels.

Properties 

U.S. Units

S.I. Units

Chemical formula

H

H

Molecular weight

2.016

2.016

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

0.00521 lb/ft3

0.08342 kg/m3

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

0.0696

0.0696

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

192.0 ft3/lb

11.99 m3/kg

Melting point at 1 atm

-434.55°F

-259.2°C

Critical temperature

-399.93°F

-239.96°C

Critical pressure

190.8 psia

1316 KPa,abs

Critical density

1.88 lb/ft3

30.12 kg/m3

Boiling point at 1 atm

-422.97°F

-252.76°C

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

0.019

0.019

Industry

Usage

Food and beverage

Used in the hydrogenation of amines and fatty acids

Glass

Used in the float glass process

Used in the heat treatment (oxyhydrogen flame) of hollow glass and optic fibres pre-forms.

Metal fabrication

Heat treatment of various metals

Electrical

Atmospheric reduction in microchip production.

Automotive

Hydrogen is a carbon free energy source used in fuel cells.

Laboratories

Used as a carrier gas in gas chromatography and in various analytical instrument applications most commonly as a fuel component of combustion gases for Flame Ionization (FID) and Flame Photometric (FPD) detectors. Spark discharge analysers and total hydrocarbon measurements also use hydrogen mixtures.

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

 

 

*

6.0

< 0.5

< 0.1

< 0.2

< 0.05

< 0.05

*

5.5

< 2.0

< 0.5

< 2.0

< 0.5

< 0.5

*

5.0

< 5

< 2

< 4

< 0.5

< 0.5

*

 

* Supplied with certificate of analysis

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