ISO 15859-4:2004规定了氦成分的限值，并确定了适用于氦成分验证的取样和试验要求。 ISO 15859-4:2004适用于以下类型和等级的飞行硬件和地面设施、系统和设备中使用的氦气:I型气态（A级:吹扫和加压氦气，F级:吹扫和加压氦气，J级:吹扫和加压氦气）和II型液态（A级:吹扫和加压氦气，F级:吹扫和加压氦气）。 ISO 15859-4:2004仅适用于规定范围内的进水。 ISO 15859-4:2004适用于确保流体进入运载火箭或航天器时，流体成分符合下文规定的限值或为特定用途商定的任何技术规范所需的任何取样操作。

ISO 15859-4:2004 specifies limits for the composition of helium and establishes the sampling and test requirements applicable for the verification of the helium composition. ISO 15859-4:2004 is applicable to helium, used in both flight hardware and ground facilities, systems and equipment, of the following types and grades:Type I, gaseous (Grade A: purging and pressurizing helium, Grade F: purging and pressurizing helium, Grade J: purging and pressurizing helium) and Type II, liquid (Grade A: purging and pressurizing helium, Grade F: purging and pressurizing helium). ISO 15859-4:2004 is applicable to influents only within the specified limits. ISO 15859-4:2004 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 to for a particular use.