1.1 本规范涵盖由至少25%的燃油制成的四个等级的燃油 % 使用过的润滑油。这四个等级的燃料拟用于各种类型的燃油燃烧工业设备和商业锅炉，在各种气候和操作条件下使用。这些燃料不适用于家用加热器。 1.1.1 RFC4、RFC5L、RFC5H和RFC6级是粘度增加的润滑油混合物，含或不含中间馏分油或残余燃料油，或两者兼有，用于工业燃烧器和配备处理此类燃料的商业锅炉。本规范适用于以下应用: D6448 不符合相关燃烧器或锅炉的性能或其他要求。 注1: 有关本规范中使用的术语和测试方法的重要性的信息，请参阅 附录X1 . 1.2 本规范适用于从使用过的润滑油中提取的燃油的采购合同以及此类燃油的消费者指南。本规范不涉及任何特定测试必须运行的频率。 1.3 本规范中的任何内容均不得妨碍遵守更具限制性的国家或地方法规。在某些管辖区，废油被视为危险废物，从废油中提取的燃料在用作燃料之前需要满足某些标准。 注2: 有关美国联邦对废油发生器、运输和转运设施、再加工厂、营销商和燃烧器的要求，请参阅40 CFR第279部分。 注3: 静电的产生和消散可能会在处理蒸馏燃烧器燃油时产生问题。有关该主题的更多信息，请参阅指南 D4865 . 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4.1 例外情况- 表1 和 表X1.1 括号中包含英寸-磅值仅供参考。 1.5 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 four grades of fuel oil made of at least 25 % used lubricating oils. The four grades of fuel are intended for use in various types of fuel-oil-burning industrial equipment and commercial boilers under various climatic and operating conditions. These fuels are not intended for use in residential heaters. 1.1.1 Grades RFC4, RFC5L, RFC5H and RFC6 are used lubricating oil blends of increasing viscosity, with or without middle distillate or residual fuel oil, or both, that are intended for use in industrial burners and commercial boilers equipped to handle these types of fuels. This specification is for applications where Specification D6448 would not meet the performance or other requirements of the burner or boiler in question. Note 1: For information on the significance of the terminology and test methods used in this specification, see Appendix X1 . 1.2 This specification is for use in contracts for the purchase of fuel oils derived from used lubricating oil and for the guidance of consumers of such fuels. This specification does not address the frequency with which any particular test must be run. 1.3 Nothing in this specification shall preclude observance of national or local regulations which can be more restrictive. In some jurisdictions, used oil is considered a hazardous waste and fuels derived from used oil are required to meet certain criteria before use as a fuel. Note 2: For United States federal requirements imposed on used oil generators, transporters and transfer facilities, reprocessors, marketers, and burners, see 40 CFR Part 279. Note 3: The generation and dissipation of static electricity can create problems in the handling of distillate burner fuel oils. For more information on the subject, see Guide D4865 . 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4.1 Exception— Table 1 and Table X1.1 include inch-pound values in parentheses for information only. 1.5 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.