本文件规定了用于在汽车空调系统中循环液体和气体R1234yf（四氟丙烯）的橡胶或热塑性软管和软管组件的要求。软管和软管组件的设计应能限制制冷剂损失和系统污染。工作温度范围为-40°C至+125°C。 由于该应用中软管和联轴器之间的关键关系，已制定了使用中的联轴器用于测试的要求。

This document specifies the requirements for rubber or thermoplastic hoses and hose assemblies used for circulating liquid and gaseous R1234yf (tetrafluoropropene) in the air-conditioning systems of automobiles. The hoses and hose assemblies are designed in such a way as to restrict losses of refrigerant and contamination of the system. The operational temperature range is？40 °C to +125 °C. Due to the critical relationship between the hose and coupling for this application, a requirement that the coupling to be used in service be used for testing has been laid down.