1.1 本规范涵盖了重型发动机冷却系统用全配方乙二醇基冷却液的要求。当浓缩物在40至60℃下使用时 % 质量合适的水中乙二醇的体积浓度（见 附录X1 )或当预稀释乙二醇基发动机冷却液时（50体积 % 最小值）在没有进一步稀释的情况下使用，它们将在冬季和夏季有效发挥作用，以防止腐蚀、气蚀、冻结和沸腾。 1.2 本规范旨在涵盖由未净化或回收的乙烯或丙二醇制备的发动机冷却液的要求。 注1: D15委员会没有实质性地研究使用来自以下来源的再循环二醇的影响: •乙二醇底部 •聚酯制造废物 •飞机和跑道除冰器 •医疗废物 准备发动机冷却液。然而，当从上述来源回收的二醇用于制备发动机冷却液时，重型车队中已报告并证实了几起性能非常差的严重案例。目前正在努力更明确地定义用于制备符合本规范的发动机冷却液的二醇的纯度要求，无论是来自回收的发动机冷却液还是其他来源。 1.3 本规范规定的冷却液分类如下: 冷却剂类型 描述 I-FF 乙二醇基浓缩物 II-FF 丙二醇基浓缩物 III-FF 乙二醇预稀释液（50 vol%） IV-FF 丙二醇预稀释液（50 vol%） 1.4 符合本规范的冷却液浓缩液不需要添加任何补充冷却液添加剂（SCA），直到第一个维护间隔，此时需要SCA的维护剂量来继续保护某些重型发动机冷却系统，特别是缸体设计中的湿式缸套。SCA添加由发动机制造商或车辆制造商定义，并由其承担主要责任。如果他们没有提供说明，请遵循SCA供应商的说明。 1.5 以国际单位制表示的数值应视为标准值。 括号中给出的值仅供参考。 1.6 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、健康和环境实践，并确定监管限制的适用性。 1.7 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 requirements for fully-formulated glycol base coolants for cooling systems of heavy-duty engines. When concentrates are used at 40 to 60 % glycol concentration by volume in water of suitable quality, (see Appendix X1 ), or when prediluted glycol base engine coolants (50 volume % minimum) are used without further dilution, they will function effectively during both winter and summer to provide protection against corrosion, cavitation, freezing, and boiling. 1.2 This specification is intended to cover the requirements for engine coolants prepared from virgin or recycled ethylene or propylene glycol. Note 1: Committee D15 has not substantially studied the impact of using recycled glycols from sources such as: • glycol bottoms • polyester manufacturing waste • aircraft and runway deicers • medical waste to prepare engine coolants. However, several serious cases of very poor performance have been reported and substantiated in heavy duty fleets when recycled glycols from sources such as above have been used to prepare engine coolants. Efforts are underway to more clearly define the purity requirements for glycols used to prepare engine coolants meeting this specification, whether from recycled engine coolants or other sources. 1.3 The coolants governed by this specification are categorized as follows: Coolant Type Description I-FF Ethylene glycol base concentrate II-FF Propylene glycol base concentrate III-FF Ethylene glycol predilute (50 vol %) IV-FF Propylene glycol predilute (50 vol %) 1.4 Coolant concentrates meeting this specification do not require any addition of Supplemental Coolant Additive (SCA) until the first maintenance interval when a maintenance dose of SCA is required to continue protection in certain heavy duty engine cooling systems, particularly those of the wet cylinder liner-in-block design. The SCA additions are defined by and are the primary responsibility of the engine manufacturer or vehicle manufacturer. If they provide no instructions, follow the SCA supplier's instructions. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.6 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. 1.7 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.