1.1 本试验方法包括通过冷浸后的过滤时间来确定符合规范所有其他要求的生物柴油混合燃料（B100）的适用性 D6751 浊点低于20 °C（68 °F）以提供足够的低温操作性能，至少达到成品混合物的浊点。 1.2 以国际单位制表示的数值应视为标准值。非国际单位制仅供参考。 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 在室温下，一些可溶于或似乎可溶于生物柴油混合燃料（B100）的物质在冷却到浊点以上或在室温下放置较长时间后，将从溶液中析出。在B100和生物柴油混合物中都观察到了这种现象。这些物质会导致过滤器堵塞。该方法提供了一种加速方法，用于评估B100中这些物质的存在及其堵塞过滤器的倾向。 5.1.1 产生较短过滤时间的生物柴油混合燃料有望使生物柴油混合物的运行达到令人满意的程度，至少达到生物柴油混合物的浊点。 5.2 该试验方法可用于规范中，作为控制生物柴油和生物柴油混合物中次要过滤器堵塞成分水平的一种手段。

1.1 This test method covers the determination by filtration time after cold soak for the suitability of biodiesel fuel blendstock (B100) that meets all other requirements of Specification D6751 and has a cloud point below 20 °C (68 °F) to provide adequate low temperature operability performance to at least the cloud point of the finished blend. 1.2 The values stated in SI units are to be regarded as standard. Non-SI units are given for information only. 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 Some substances that are soluble or appear to be soluble in biodiesel fuel blendstock (B100) at room temperature will, upon cooling to temperatures above the cloud point or standing at room temperature for extended periods, come out of solution. This phenomenon has been observed in both B100 and biodiesel blends. These substances can cause filter plugging. This method provides an accelerated means of assessing the presence of these substances in B100 and their propensity to plug filters. 5.1.1 Biodiesel fuel blendstocks that yield short filtration times are expected to give satisfactory operation of biodiesel blends at least down to the cloud point of the biodiesel blends. 5.2 The test method can be used in specifications as a means of controlling levels of minor filter plugging components in biodiesel and biodiesel blends.