1.1 本试验方法包括测量动态粘度和密度，以推导透明和不透明石油液体的运动粘度。在该试验方法中，运动粘度η是通过将动力粘度η除以在相同试验温度下获得的密度ρ得出的。该试验方法还使用实践计算石油液体达到规定运动粘度的温度 D341 。 1.2 从该测试方法获得的结果取决于样品的行为，并且用于主要剪切应力和剪切速率成比例的液体（牛顿流动行为）。 1.3 该试验方法所涵盖的运动粘度范围为0.5 毫米 2. /s到1000 毫米 2. /s在-40°C至120°C的温度范围内；然而，该精度仅对2.06范围内的燃料和油进行了测定 毫米 2. /s到476 毫米 2. /s在40°C和1.09 毫米 2. /s  至107 毫米 2. /100°C时的s（如第节所述 12 关于精度和偏差）。对于喷气燃料，运动粘度的精度已确定在2.957的范围内 毫米 2. /s至5.805 毫米 2. /s在–20 °C和5.505 毫米 2. /s至13.03 毫米 2. /s在-40 °C（如第节所述 12 关于精度和偏差），以及温度在12 毫米 2. /s（cSt）的测定范围为–38.3 °C至–58.1 °C（如第节所述 13 关于精度和偏差）。精度仅针对第节中所述的材料、粘度范围和温度进行了确定 12 关于精度和偏差。该测试方法可以应用于更广泛的材料、粘度和温度。对于第节中未列出的材料 12 关于精度和偏差，精度和偏差可能不适用。 1.4 以国际单位制表示的数值应视为标准。本标准中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 许多石油产品被用作润滑剂，设备的正确操作取决于所用液体的适当粘度。此外，许多石油燃料的粘度对于估计最佳储存、处理和操作条件很重要。 因此，粘度的准确测定对于许多产品规格来说是至关重要的。 5.2 密度是一种基本的物理性质，可与其他性质一起用于表征石油和石油产品的轻馏分和重馏分，在本试验中，该方法用于计算动态粘度和运动粘度。

1.1 This test method covers the measurement of dynamic viscosity and density for the purpose of derivation of kinematic viscosity of petroleum liquids, both transparent and opaque. The kinematic viscosity, ν, in this test method is derived by dividing the dynamic viscosity, η, by the density, ρ, obtained at the same test temperature. This test method also calculates the temperature at which petroleum liquids attain a specified kinematic viscosity using Practice D341 . 1.2 The result obtained from this test method is dependent upon the behavior of the sample and is intended for application to liquids for which primarily the shear stress and shear rate are proportional (Newtonian flow behavior). 1.3 The range of kinematic viscosity covered by this test method is from 0.5 mm 2 /s to 1000 mm 2 /s in the temperature range between –40 °C to 120 °C; however the precision has been determined only for fuels and oils in the range of 2.06 mm 2 /s to 476 mm 2 /s at 40 °C and 1.09 mm 2 /s  to 107 mm 2 /s at 100 °C (as stated in Section 12 on Precision and Bias). For jet fuels, the precision of kinematic viscosity has been determined in the range of 2.957 mm 2 /s to 5.805 mm 2 /s at –20 °C and 5.505 mm 2 /s to 13.03 mm 2 /s at –40 °C (as stated in Section 12 on Precision and Bias), and the precision of the temperature at 12 mm 2 /s (cSt) has been determined in the range of –38.3 °C to –58.1 °C (as stated in Section 13 on Precision and Bias). The precision has only been determined for those materials, viscosity ranges, and temperatures as indicated in Section 12 on Precision and Bias. The test method can be applied to a wider range of materials, viscosity, and temperature. For materials not listed in Section 12 on Precision and Bias, the precision and bias may not be applicable. 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 Many petroleum products are used as lubricants and the correct operation of the equipment depends upon the appropriate viscosity of the liquid being used. In addition, the viscosity of many petroleum fuels is important for the estimation of optimum storage, handling, and operational conditions. Thus, the accurate determination of viscosity is essential to many product specifications. 5.2 Density is a fundamental physical property that can be used in conjunction with other properties to characterize both the light and heavy fractions of petroleum and petroleum products and in this test method is used for the calculation from dynamic to kinematic viscosity.