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CGA G-7.1-2018
Commodity Specification for Air - Seventh Edition
Describes the specification requirements for air including atmospheric air and air synthesized by blending oxygen and nitrogen in the proper proportions. Atmospheric air contains a large variety of trace constituents. It is impractical to set individual limits for many of these; however, this specification qualifies certain grades of air by limiting the concentrations of specific trace constituents.
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Compressed Gas Association, Inc. [cga]
Compressed Gas Association, Inc. [cga]