This publication 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.

The term container as used in this publication shall refer to portable compressed gas cylinders and liquid containers made in accordance with Title 49 of the U.S. Code of Federal Regulations (49 CFR) Parts 100-180; Transport Canada's (TC) Transportation of Dangerous Goods Regulations; or ASME Boiler and Pressure Vessel Code, Section VIII, Div 1 [1, 2, 3].¹

NOTE—This publication does not attempt to recommend or establish end usage designations for specific types or grades of products. It is suggested that users requiring this kind of information contact individual gas suppliers.

¹ References are shown by bracketed numbers and are listed in order of appearance in the reference section.

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