1.1 本试验方法涵盖了通过使用光学检测的自动仪器量化油中沥青质固有稳定性的程序。 1.2 本试验方法适用于热裂解和加氢裂化过程中的残余产品，以及规范中的典型产品 第396页 5L、5H和6级，以及 880英镑 3-GT和4-GT级，以及原油，前提是这些产品含有0.5 % 按质量或更高浓度的沥青质（见试验方法 第6560页 ). 1.3 该试验方法根据沥青质的胶溶状态来量化沥青质的稳定性( S -值），油性介质的内在稳定性( 所以 )以及胶石化沥青质的溶解能力要求( Sa公司 ). 1.4 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 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）。本标准的使用者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。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 该试验方法描述了一种用于估计石油内在稳定性的灵敏方法。内在稳定性表示为 S -价值。一种油位低的机油 S -当受到应力（例如，延长加热储存）或与一系列其他油混合时，该值可能会发生沥青质的絮凝。两种油，每种都有一个高 S -该值可能使沥青质保持胶凝状态，并且在混合在一起时不会导致沥青质絮凝。 5.2 该测试方法可用于炼油厂控制和优化炼油工艺，也可用于搅拌机和营销人员评估混合沥青质重质燃料油的内在稳定性。

1.1 This test method covers procedures for quantifying the intrinsic stability of the asphaltenes in an oil by automatic instruments using optical detection. 1.2 This test method is applicable to residual products from thermal and hydrocracking processes, to products typical of Specifications D396 Grades No. 5L, 5H, and 6, and D2880 Grades No. 3-GT and 4-GT, and to crude oils, providing these products contain 0.5 % by mass or greater concentration of asphaltenes (see Test Method D6560 ). 1.3 This test method quantifies asphaltene stability in terms of state of peptization of the asphaltenes ( S -value), intrinsic stability of the oily medium ( So ) and the solvency requirements of the peptized asphaltenes ( Sa ). 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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, health, and environmental 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. ====== Significance And Use ====== 5.1 This test method describes a sensitive method for estimating the intrinsic stability of an oil. The intrinsic stability is expressed as S -value. An oil with a low S -value is likely to undergo flocculation of asphaltenes when stressed (for example, extended heated storage) or blended with a range of other oils. Two oils each with a high S -value are likely to maintain asphaltenes in a peptized state and not lead to asphaltene flocculation when blended together. 5.2 This test method can be used by petroleum refiners to control and optimize the refinery processes and by blenders and marketers to assess the intrinsic stability of blended asphaltene-containing heavy fuel oils.