1.1 本试验方法包括测定使用过的润滑油中的戊烷和甲苯不溶物。 1.2 程序A 包括在戊烷中不使用凝聚剂的情况下测定不溶物。它提供了通过离心很容易从油溶剂混合物中分离出的材料的指示。 1.3 程序B 涵盖了含洗涤剂的油中不溶物的测定，并对戊烷和甲苯不溶物使用了凝固剂。除了使用程序A分离的物质外，该凝固程序还分离出一些可能悬浮在油中的精细物质。 注1: 通过程序A和B获得的结果不应进行比较，因为它们通常给出不同的值。当比较在用机油上定期获得的值或比较两个或多个实验室确定的结果时，应采用相同的程序。 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。 1.5 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。 有关具体的警告声明，请参阅第节 7. 和 9.1.1 . 1.6 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 戊烷不溶物可包括油不溶性材料和一些来自油或添加剂降解的油不溶性树脂物质，或两者兼而有之。 5.2 甲苯不溶物可来自( 1. )外部污染( 2. )燃料、油和添加剂降解产生的燃料碳和高碳化材料，或( 3. )发动机磨损和腐蚀材料。 5.3 戊烷不溶物、甲苯不溶物（含或不含凝固剂）和不溶性树脂的显著变化表明油的变化可能导致润滑系统问题。 5.4 测量的不溶物也有助于评估废油的性能特征或确定设备故障的原因。

1.1 This test method covers the determination of pentane and toluene insolubles in used lubricating oils. 1.2 Procedure A covers the determination of insolubles without the use of coagulant in the pentane. It provides an indication of the materials that can readily be separated from the oil-solvent mixtures by centrifuging. 1.3 Procedure B covers the determination of insolubles in oils containing detergents and employs a coagulant for both the pentane and toluene insolubles. In addition to the materials separated by using Procedure A, this coagulation procedure separates some finely divided materials that may be suspended in the oil. Note 1: Results obtained by Procedures A and B should not be compared since they usually give different values. The same procedure should be employed when comparing values obtained periodically on an oil in use or when comparing results determined by two or more laboratories. 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. For specific warning statements, see Section 7 and 9.1.1 . 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 Pentane insolubles can include oil-insoluble materials and some oil-insoluble resinous matter originating from oil or additive degradation, or both. 5.2 Toluene insoluble materials can come from ( 1 ) external contamination, ( 2 ) fuel carbon and highly carbonized materials from degradation of fuel, oil, and additives, or ( 3 ) engine wear and corrosion materials. 5.3 A significant change in pentane insolubles, toluene insolubles (with or without coagulant), and insoluble resins indicates a change in oil which could lead to lubrication system problems. 5.4 Insolubles measured can also assist in evaluating the performance characteristics of a used oil or in determining the cause of equipment failure.