1.1 本试验方法涵盖了从石油沥青中分离四种定义的馏分。这四种馏分被定义为饱和烃、环烷芳烃、极性芳烃和异辛烷不溶性沥青质。该方法还可用于从馏分产品（如减压瓦斯油、润滑油和循环油）中分离饱和烃、环烷芳烃和极性芳烃。这些馏出物通常不含沥青质。 1.2 以国际单位制表示的数值应视为标准值。 1.3 由于尚未制定本标准的精度估计，本试验方法仅用于研究或信息目的。 因此，本标准不应用于验收或拒收用于采购目的的材料。 1.4 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。 第节给出了具体的预防说明 8. . 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。 ====意义和用途====== 5.1 该试验方法将沥青分为四个定义明确的部分。这些组分的分析可用于评估沥青成分 ( 1. , 2. ) . 4. 例如，可以将这些组分的比率与其他沥青系统进行比较，以评估与沥青性能相关的加工和老化参数。

1.1 This test method covers the separation of four defined fractions from petroleum asphalts. The four fractions are defined as saturates, naphthene aromatics, polar aromatics, and iso-octane insoluble asphaltenes. This method can also be used to isolate saturates, naphthene aromatics, and polar aromatics from distillate products such as vacuum gas oils, lubricating oils, and cycle stocks. These distillate products usually do not contain asphaltenes. 1.2 The values stated in SI units are to be regarded as standard. 1.3 Since a precision estimate for this standard has not been developed, this test method is to be used for research or informational purposes only. Therefore, this standard should not be used for acceptance or rejection of a material for purchasing purposes. 1.4 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. Specific precautionary statements are given in Section 8 . 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. ====== Significance And Use ====== 5.1 This test method separates asphalts into four well-defined fractions. Analysis of these fractions can be used to evaluate asphalt composition ( 1 , 2 ) . 4 For example, one can compare the ratios of the fractions with other asphalt systems to evaluate processing and aging parameters that relate to performance properties of the asphalt.