1.1 本试验方法包括测定市售SCA与市售乙二醇和丙二醇发动机冷却液浓缩液的兼容性。该试验方法的重点是发动机冷却液中形成的特定化学物质的溶解度。试验持续时间短（24小时），除其他限制外，使得该试验方法在解决各种化学兼容性问题方面的用途有限，在这些问题中，SCA的成分可能与冷却液添加剂包的成分发生反应。目前编写的测试也没有涉及硬水兼容性问题，即冷却液或SCA添加剂包的成分与硬度（Ca和Mg）反应形成沉淀物。 1.2 以国际单位制表示的数值应视为标准。括号中给出的值是英寸磅单位的数学转换，仅供参考，不被视为标准。 1.3 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。 1.4 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 该测试旨在模拟20世纪80年代中期在一些重型柴油冷却系统中观察到的不溶物的形成。它根据SCA和冷却液浓缩液在使用中形成不溶物的趋势来测量它们的兼容性。 3. 这种不溶性材料可能积聚在冷却系统内，限制通过散热器芯的热传递，并导致水泵等部件损坏。

1.1 This test method covers determination of the compatibility of commercial SCA and commercial ethylene and propylene glycol engine coolant concentrates. This test method focuses on the solubility of specific chemical species formed in the engine coolant. The short duration of the test (24 h), among other restrictions, makes the test method of limited use for sorting out a variety of chemical compatibility problems in which a component of the SCA may react with a component of the coolant additive package. The test as currently written also does not deal with the issue of hard water compatibility, in which a component of the coolant or SCA additive package reacts with the hardness (Ca and Mg) to form a precipitate. 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that 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 This test was developed to mimic the formation of insolubles observed in some heavy-duty diesel cooling systems during the mid 1980s. It measures the compatibility of SCA and coolant concentrate solutions according to their tendency to form insolubles in service. 3 Such insoluble materials may accumulate within a cooling system, restrict heat transfer through radiator cores, and contribute to the damage of components such as water pumps.