ISO 15859-12:20 04规定了二氧化碳（CO2）成分的限值，并建立了适用于二氧化碳成分验证的取样和测试要求。 ISO 15859-12:20 04适用于空间系统飞行硬件和地面支持设施、系统和设备中用于净化和加压的二氧化碳的成分、取样和测试方法。ISO 15859-12:20 04可应用于二氧化碳流入物。二氧化碳可以是气态或液态类型。 ISO 15859-12:20 04适用于任何取样操作，以确保当流体进入运载火箭或航天器时，流体成分符合下文提供的限值或为特定用途商定的任何技术规范。

ISO 15859-12:2004 specifies limits for the composition of carbon dioxide (CO₂) and establishes the sampling and test requirements applicable for the verification of the carbon dioxide composition. ISO 15859-12:2004 is applicable to composition, sampling, and test methods for carbon dioxide intended for purging and pressurization in both space systems flight hardware and ground support facilities, systems, and equipment. ISO 15859-12:2004 may be applied to carbon dioxide influents. Carbon dioxide may be of the gaseous or liquid type. ISO 15859-12:2004 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.