1.1 本试验方法涵盖了测定柴油、柴油、残余燃料油、润滑油、沥青和已加满260℃油温的原油中庚烷不溶性沥青质含量的程序 °C（见 A1.2.1.1 ). 1.2 精度适用于0.50之间的值 % 米/米和30.0 % 米/米。超出此范围的值可能仍然有效，但可能不会给出相同的精度值。 1.3 含有添加剂的油可能会产生错误的结果。 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。 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 沥青质是分子质量和碳氢比最高的有机分子，通常存在于原油和含有残余物质的石油产品中。如果沥青质分子的悬浮液因过度应力或不相容性而受到干扰，则在储存和处理过程中可能会出现问题。它们也是产品中最后一个完全燃烧的分子，因此可能是黑烟倾向的指标之一。它们的成分通常包括原油或石油产品中存在的不成比例的大量硫、氮和金属。

1.1 This test method covers a procedure for the determination of the heptane insoluble asphaltene content of gas oil, diesel fuel, residual fuel oils, lubricating oil, bitumen, and crude petroleum that has been topped to an oil temperature of 260 °C (see A1.2.1.1 ). 1.2 The precision is applicable to values between 0.50 % m/m and 30.0 % m/m. Values outside this range may still be valid but may not give the same precision values. 1.3 Oils containing additives may give erroneous results. 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 Asphaltenes are the organic molecules of highest molecular mass and carbon-hydrogen ratio normally occurring in crude petroleum and petroleum products containing residual material. They may give problems during storage and handling if the suspension of asphaltene molecules is disturbed through excess stress or incompatibility. They are also the last molecules in a product to combust completely, and thus may be one indicator of black smoke propensity. Their composition normally includes a disproportionately high quantity of the sulfur, nitrogen, and metals present in the crude petroleum or petroleum product.