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Industrial and Medical Gas Specifications (U.S.)

Argon

Purity99.997%
OxygenLess than 0.0005%
Dew Point
Liquid Argon: –90ºF or lower

Helium – Gaseous

Purity99.995%
OxygenLess than 0.0005%
Dew Point
–90ºF or lower

Helium – Liquid

PurityNot less than 99.999%
OxygenNot more than 0.0001%
Dew Point
–105ºF or lower

Hydrogen – Gaseous

Purity99.95%
OxygenLess than 0.0005%
Dew Point
Gaseous Hydrogen: –90ºF or lower

Hydrogen – Liquid

Purity99.999%
OxygenLess than 0.0002%
Dew Point
Liquid Hydrogen:  –105ºF or lower

Medical Helium – Gaseous – meets USP

PurityNot less than 99.0%
OxygenNot more than 1.0%
Carbon Monoxide
Not more than 0.001%
Odor
None

Medical Nitrogen – meets Nitrogen NF

Nitrogen and trace inerts99.0%
OxygenNot more than than 1.0%
Carbon Monoxide
Less than 0.001%
Odor
None

Medical Oxygen – meets Oxygen USP

Oxygen99.0%
Odor
None

Nitrogen

Nitrogen and trace inerts99.998%
OxygenLess than 0.001%
Dew Point
Liquid Nitrogen: –90ºF or lower

Oxygen

Purity99.5%
InertsLess than 0.5%
Dew Point
Liquid Oxygen: –80ºF or lower