1.1 本规范涵盖了用于汽车或其他轻型服务冷却系统的1,3丙二醇基发动机冷却液的要求。当浓度为40时 % 水的体积浓度为70%，或使用预稀释的乙二醇基发动机冷却液（最小50%）而不进一步稀释时，它们将有效地提供防冻、沸腾和腐蚀保护。 1.2 本规范规定的冷却液分类如下: 冷却剂类型 描述 我 1,3丙二醇基浓缩物 二、 1,3丙二醇预稀释液（50 vol%） 注1: 本规范基于对由新成分或原始成分制备的发动机冷却液性能的了解。 注2: 本规范适用于汽车和轻型服务。重型发动机服务规范正在制定中。 1.3 以国际单位制表示的数值应视为标准值。 国际单位制后括号中给出的值仅供参考，不被视为标准值。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers the requirements for 1,3 propanediol base engine coolants used in automobiles or other light-duty service cooling systems. When concentrates are used at 40 % to 70 % concentration by volume in water, or when prediluted glycol base engine coolants (50 volume % minimum) are used without further dilution, they will function effectively to provide protection against freezing, boiling, and corrosion. 1.2 The coolants governed by this specification are categorized as follows: Coolant Type Description I 1,3 Propanediol base concentrate II 1,3 Propanediol predilute (50 vol %) Note 1: This specification is based on the knowledge of the performance of engine coolants prepared from new or virgin ingredients. Note 2: This specification applies to automobiles and light-duty service. A specification for heavy-duty engine service is under development. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.