This part of ISO 15859 specifies limits for the composition of ammonia (NH3) and establishes the sampling and test requirements applicable for the verification of the ammonia composition. This part of ISO 15859 is applicable to sampling and test methods for ammonia used in both flight hardware and ground support facilities, systems, and equipment. This part of ISO 15859 is applicable to ammonia influents only within the specified limits herein. This part of ISO 15859 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 to for a particular use.