1.1 本试验方法包括通过自动仪器测定石油产品的倾点，该仪器在试样冷却过程中对着悬浮检测装置连续旋转试样。 1.2 本试验方法旨在涵盖以下温度范围:−57 °C至+51 °C；然而，1992年实验室间计划中包含的温度范围仅涵盖−39 °C至+6 °C（见 13.4 ). 1.3 本试验方法通过检测样品中足以阻碍样品流动的晶体结构或粘度增加或两者兼有来确定石油产品的无流动点。 1.4 本试验方法不适用于原油。 注1: 尚未验证该试验方法对残余燃料样品的适用性。有关适用性的更多信息，请参阅 13.4 . 1.5 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。 1.6 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。 1.7 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 石油产品的倾点是其在某些应用中的最低使用温度的指标。流动特性（如倾点）对于润滑系统、燃料系统和管道操作的正确运行至关重要。 5.2 石油混合操作需要精确测量倾点。 5.3 该测试方法可以以0.1的分辨率确定试样的温度 °C，在此温度下形成晶体或粘度增加到足以阻碍石油产品的移动。 5.4 该试验方法得出的倾点格式与试验方法类似 D97 /IP15当3 报告了°C间隔结果。 注2: 因为一些用户可能希望以类似于测试方法的格式报告其结果 D97 （在3中 °C区间）得出四舍五入到3的温度的精度 °C间隔。对于与测试方法相关的偏差声明 D97 看见 13.3 . 5.5 与试验方法相比，该试验方法具有更好的重复性和可比再现性 D97 根据1992年实验室间计划的测量。（参见第节 13 .)

1.1 This test method covers the determination of pour point of petroleum products by an automatic instrument that continuously rotates the test specimen against a suspended detection device during cooling of the test specimen. 1.2 This test method is designed to cover the range of temperatures from −57 °C to +51 °C; however, the range of temperatures included in the 1992 interlaboratory program only covered the temperature range of −39 °C to +6 °C (see 13.4 ). 1.3 This test method determines the no-flow point of petroleum products by detection of the crystal structure or viscosity increase, or both, in the sample that is sufficient to impede flow of the specimen. 1.4 This test method is not intended for use with crude oils. Note 1: The applicability of this test method on residual fuel samples has not been verified. For further information on applicability, refer to 13.4 . 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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. 1.7 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 pour point of a petroleum product is an index of the lowest temperature of its utility for certain applications. Flow characteristics, such as pour point, can be critical for the correct operation of lubricating systems, fuel systems, and pipeline operations. 5.2 Petroleum blending operations require precise measurement of the pour point. 5.3 This test method can determine the temperature of the test specimen with a resolution of 0.1 °C at which either crystals have formed or viscosity increases sufficiently to impede movement of the petroleum product. 5.4 This test method yields a pour point in a format similar to Test Method D97 /IP15 when the 3 °C interval results are reported. Note 2: Since some users may wish to report their results in a format similar to Test Method D97 (in 3 °C intervals) the precisions were derived for the temperatures rounded to the 3 °C intervals. For statements on bias relative to Test Method D97 , see 13.3 . 5.5 This test method has better repeatability and comparable reproducibility relative to Test Method D97 as measured in the 1992 interlaboratory program. (See Section 13 .)