1.1本规范涵盖了丙二醇基发动机冷却液浓缩液的要求。当在水中浓度为40%至70%时，它将在冬季和夏季有效发挥作用。该材料旨在为汽车或其他轻型服务冷却系统提供防冻、沸腾和腐蚀保护。 注1-本规范基于对由新成分或原始成分制备的发动机冷却液性能的了解。详见附录X3。 1.2本规范采用报价单位。 括号中的值是近似等效值，仅供参考。 1.3本标准无意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。X2.4中给出了具体的预防说明。 注2-本规范适用于汽车和轻型服务。重柴油用丙二醇基冷却液的单独规范- 值班发动机服务正在开发中。

1.1 This specification covers requirements for propylene glycol-base engine coolant concentrate. When used at 40 to 70% concentration in water, it will function effectively during both winter and summer. This material is intended to provide protection from freezing, boiling, and corrosion in automobile or other light-duty service cooling systems. Note 1-This specification is based on the knowledge of the performance of engine coolants prepared from new or virgin ingredients. See Appendix X3 for more information. 1.2 This specification is in the units quoted. The values in parentheses are approximate equivalents given 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. A specific precautionary statement is given in X2.4. Note 2-This specification applies to automobiles and light-duty service. A separate specification for a propylene glycol base coolant for heavy-duty engine service is under development.