1.1 本试验方法包括发动机冷却液水溶液凝固点的测定。 1.2 本试验方法适用于最大浓度为60的乙二醇基冷却剂 % （v/v）在水中；然而，在 12.2 仅用浓度范围为40的样品证明了测试方法 % 至60 % （v/v）水。 注1: 如果要测试特定浓度的溶液，则应按照实践中的指示，从具有代表性的样品中制备溶液 D1176 .稀释时分离的第二相无需分离。 注2: 这些产品也可以以即用型（预稀释）的形式在市场上销售。 1.3 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 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。 中给出了一些具体的危险说明 7.3 。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 5.1 发动机冷却液的冰点表示冷却液的防冻保护。 5.2 发动机冷却液的凝固点可用于确定大致的乙二醇含量，前提是乙二醇类型已知。 5.3 通过试验方法测量的凝固点 D1177 或批准的替代方法是规范中的要求 D3306 和 D6210 。 5.4 此测试方法提供的结果与测试方法等效 D1177 并将结果精确到0.1 °C，再现性优于试验方法 D1177 。 5.5 该试验方法在比试验方法更短的时间内确定凝固点 D1177 。 5.6 该测试方法消除了测试方法所需的大部分操作员时间和判断 D1177 。

1.1 This test method covers the determination of the freezing point of an aqueous engine coolant solution. 1.2 This test method is designed to cover ethylene glycol base coolants up to a maximum concentration of 60 % (v/v) in water; however, the ASTM interlaboratory study mentioned in 12.2 has only demonstrated the test method with samples having a concentration range of 40 % to 60 % (v/v) water. 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: The products may also be marketed in a ready-to-use form (prediluted). 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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. Some specific hazards statements are given in 7.3 . 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. ====== 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 content, provided the glycol type is known. 5.3 Freezing point as measured by Test Method D1177 or approved alternative method is a requirement in Specifications D3306 and D6210 . 5.4 This test method provides results that are equivalent to Test Method D1177 and expresses results to the nearest 0.1 °C with improved reproducibility over Test Method D1177 . 5.5 This test method determines the freezing point in a shorter period of time than Test Method D1177 . 5.6 This test method removes most of the operator time and judgement required by Test Method D1177 .