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Industrial and Medical Gas Specifications (U.S.)

Argon

Purity 99.997%
Oxygen Less than 0.0005%
Dew Point
Liquid Argon: –90ºF or lower

Helium – Gaseous

Purity 99.995%
Oxygen Less than 0.0005%
Dew Point
–90ºF or lower

Helium – Liquid

Purity Not less than 99.999%
Oxygen Not more than 0.0001%
Dew Point
–105ºF or lower

Hydrogen – Gaseous

Purity 99.95%
Oxygen Less than 0.0005%
Dew Point
Gaseous Hydrogen: –90ºF or lower

Hydrogen – Liquid

Purity 99.999%
Oxygen Less than 0.0002%
Dew Point
Liquid Hydrogen:  –105ºF or lower

Medical Helium – Gaseous – meets USP

Purity Not less than 99.0%
Oxygen Not more than 1.0%
Carbon Monoxide
Not more than 0.001%
Odor
None

Medical Nitrogen – meets Nitrogen NF

Nitrogen and trace inerts 99.0%
Oxygen Not more than than 1.0%
Carbon Monoxide
Less than 0.001%
Odor
None

Medical Oxygen – meets Oxygen USP

Oxygen 99.0%
Odor
None

Nitrogen

Nitrogen and trace inerts 99.998%
Oxygen Less than 0.001%
Dew Point
Liquid Nitrogen: –90ºF or lower

Oxygen

Purity 99.5%
Inerts Less than 0.5%
Dew Point
Liquid Oxygen: –80ºF or lower