ISO 18611-3:2014描述了ISO 18611-1中规定的NOx还原剂AUS 40（尿素水溶液）的搬运、运输和储存的最佳实践建议和要求。为了确保选择性催化还原（SCR）转换器系统的正常功能，从任何生产点到将AUS 40加注到车辆车载油箱的位置，这些建议和要求都是必要的。 本国际标准涵盖了适用于船舶应用的AUS 40的质量要求和指南，与制造方法或技术无关。

ISO 18611-3:2014 describes best practice recommendations and requirements for handling, transportation, and storage of NOx reduction agent AUS 40 (aqueous urea solution), specified in ISO 18611-1. These recommendations and requirements are necessary to preserve the specified quality of AUS 40 from any point of production to the point where it is filled into the on-board tank of the vehicle, in order to ensure the proper function of the selective catalytic reduction (SCR) converter systems. This International Standard is covering quality requirements and guidelines for AUS 40 for marine applications, irrespective of manufacturing method or technique.