1.1 本试验方法包括测定二醇、甘油、传热液、发动机冷却液浓缩液和含水发动机冷却液的相对密度。 1.2 以国际单位表示的数值视为标准值。SI单位后括号中给出的值仅供参考，不视为标准值。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.4 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。 =====意义和用途====== 4.1 如果已知乙二醇类型，可使用发动机冷却液的相对密度来确定乙二醇的近似百分比、冰点和沸点。 4.2 发动机冷却液浓缩液的相对密度可用作生产控制测试。 4.3 ASTM规范通常规定了流体相对密度的温度；25 摄氏度，20 °C和15.6 °C是常用温度。

1.1 This test method covers the determination of the relative density of glycols, glycerin, heat transfer fluids, engine coolant concentrates, and aqueous engine coolants. 1.2 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. 1.3 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. 1.4 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. ====== Significance And Use ====== 4.1 The relative density of an engine coolant may be used to determine the approximate percent glycol, freezing point, and boiling point, provided the glycol type is known. 4.2 The relative density of an engine coolant concentrate can be used as a production control test. 4.3 ASTM specifications normally state the temperatures for relative density of fluids; 25 °C, 20 °C, and 15.6 °C are commonly used temperatures.