1.1 本规范涵盖了重型发动机冷却系统中预充水平下补充冷却液添加剂（SCA）的一般、物理、化学和性能要求。 注1: 预充电后，通常定期使用SCA为冷却系统提供服务 1. / 4. 到 1. / 3. 用于补偿因稀释和消耗而损失的添加剂的预充电剂量。 1.2 符合本规范的SCA产品旨在与水、推荐的冷却液浓缩液稀释液、预稀释的发动机冷却液一起使用，或用于提高光的性能- 负载发动机冷却液，以满足规范的高负载要求 D6210 . 发动机冷却液产品应为低硅酸盐型，如果以乙二醇为基础，则应符合规范要求 D4985 . 如果这些材料满足规范的化学和性能要求，也可以使用丙二醇基低硅酸盐型冷却液产品 D4985 . 1.3 在溶解之前，SCA浓缩物可以是液体、固体或浆液形式。表格由制造商和用户商定。 1.4 以国际单位制表示的数值应视为标准值。括号中的英寸-磅单位为近似等效单位，仅供参考。 1.5 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。 1.6 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。

1.1 This specification covers the general, physical, chemical, and performance requirements for Supplemental Coolant Additives (SCAs) at a precharged level in the cooling systems of heavy-duty engines. Note 1: After precharging, SCAs are customarily used periodically to service cooling systems at 1 / 4 to 1 / 3 the precharged dosage to compensate for additives lost through dilution and depletion. 1.2 The SCA products meeting this specification are intended for use with water, with recommended dilutions of coolant concentrates, with prediluted engine coolants, or to upgrade the performance of light-duty engine coolants to meet the heav-duty requirements of Specification D6210 . Engine coolant products shall be of the low-silicate type and, if ethylene glycol based, shall meet Specification D4985 . Propylene glycol base low-silicate type coolant products may also be used, if these materials meet the chemical and performance requirements of Specification D4985 . 1.3 The SCA concentrate, before dissolution, may be in either liquid, solid, or slurry form. The form is as agreed upon between the manufacturer and the user. 1.4 The values stated in SI units are to be regarded as standard. The inch-pound units in parentheses are approximate equivalents provided for information only. 1.5 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. 1.6 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.