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Aerospace series. Space systems. Fluid characteristics, sampling and test methods - Nitrogen Ingestion-build-54371 in hairdressers1 Scope This part of ISO 15859 specifies limits for the composition of nitrogen and establishes the sampling and test requirements applicable for the verification of nitrogen composition. This part of ISO 15859 is applicable to nitrogen, used in both flight hardware and ground facilities, systems and equipment, of the following types and grades of nitrogen. Type I: gaseous Grade A: purging pressurizing, Grade B: crew breathing, Grade C, Grade F, Grade