ISO 15859-1:2004 specifies the limit values for the composition of oxygen and establishes the sampling and test requirements applicable for the verification of the oxygen composition.

ISO 15859-1:2004 is applicable to oxygen used in both flight hardware and ground facilities, systems and equipment, of the following types and grades: Type I, gaseous (Grade A: standard, purging/pressurization, Grade CB: crew breathing, Grade F: fuel-cell) and Type II, liquid (Grade A: oxidize, Grade B: oxidizer, Grade F: fuel-cell).

ISO 15859-1:2004 is applicable to influents only to the extent specified herein.

ISO 15859-1:2004 is applicable to any sampling operation required to ensure that, when the fluid enters the launch vehicle or spacecraft, the fluid composition complies with the limits provided hereafter or with any technical specification agreed for a particular use.