1.1 本试验方法描述了使用旋转粘度计测定剪切速率相关（非牛顿）流体的剪切稀化指数。单位剪切稀化指数的值表明材料的行为是牛顿的。大于1的值表示剪切变薄行为。 1.2 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。 1.3 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。 1.4 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 许多感兴趣的流体的流动行为本质上是非牛顿的。最好使用流变仪研究非牛顿行为。尽管如此，可以通过使用旋转粘度计记录不同转速（或剪切速率）下的粘度来估计非牛顿行为。 5.2 剪切稀化指数为估计非牛顿行为量提供了工具。 5.3 剪切变薄指数可用于质量评估、故障排除、规范验收和研究。

1.1 This test method describes the determination of the shear thinning index of a shear-rate dependent (non-Newtonian) fluid using a rotational viscometer. A value of the shear thinning index of unity indicates that the material is Newtonian in behavior. A value greater than unity indicates shear thinning behavior. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 1.4 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 The flow behavior of many fluids of interest is non-Newtonian in nature. Non-Newtonian behavior is best studied using rheometry apparatus. Nonetheless, estimations on non-Newtonian behavior may be made by recording viscosity at differing rotational speeds (or shear rates) using rotational viscometers. 5.2 The shear thinning index provides a tool for the estimation of the amount of non-Newtonian behavior. 5.3 The shear thinning index may be used in quality assessment, trouble shooting, specification acceptance, and research.