1.1 本试验方法包括在实验室中测定水性发动机冷却液溶液的冰点。 注1: 如果要测试特定浓度的溶液，则应按照实践中的指示，从代表性样品中制备溶液 D1176号 .稀释时不需要分离二次相。 注2: 这些产品也可以以即用形式销售（预先稀释）。 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====== 5.1 发动机冷却液的冰点表示冷却液冻结保护。 5.2 如果乙二醇类型已知，发动机冷却液的冰点可用于确定乙二醇或甘油的近似含量。

1.1 This test method covers the determination of the freezing point of an aqueous engine coolant solution in the laboratory. Note 1: Where solutions of specific concentrations are to be tested, they shall be prepared from representative samples as directed in Practice D1176 . Secondary phases separating on dilution need not be separated. Note 2: These products may also be marketed in a ready-to-use form (prediluted). 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 ====== 5.1 The freezing point of an engine coolant indicates the coolant freeze protection. 5.2 The freezing point of an engine coolant may be used to determine the approximate glycol or glycerin content, provided the glycol type is known.