1.1本试验方法包括测定商用SCA和商用乙烯和丙二醇发动机冷却液浓缩液的兼容性。本试验方法侧重于发动机冷却液中形成的特定化学物质的溶解度。除其他限制外，试验持续时间短（24小时），使得试验方法在分类各种化学相容性问题方面的用途有限，在这些问题中，SCA的一种成分可能与冷却剂添加剂包的一种成分发生反应。目前编写的试验也不涉及硬水相容性问题，即冷却剂或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。括号中给出的值仅供参考。 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）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 本试验旨在模拟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其兼容性。 这些不溶性物质可能会在冷却系统内积聚，限制通过散热器芯的传热，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 the standard. The values given in parentheses are for information only. 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 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. 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.