1.1 本试验方法包括测定液体中间馏分燃料（包括与合成烃或生物燃料混合的燃料）中悬浮水和颗粒污染物（雾度）水平的光谱方法。 1.1.1 在22.0℃±2.0℃的温度下，在试样上测定1至6的序数整数仪器雾度等级(IHR)和50.0至100.0的雾度澄清指数(HCI)。 1.1.1.1 所述精度仅适用于该温度。 1.1.1.2 在其他试样温度下分析的燃料可能不那么精确。 1.2 以SI单位表示的值将被视为标准值。本标准中包含的其他计量单位在第节中定义 3 . 1.3 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 长期以来的做法是在燃料规格中包括燃料清澈明亮的要求。 5.2 不符合本质量标准要求的一个主要原因是出现由悬浮固体颗粒或水或两者的某种组合引起的混浊或朦胧外观。5.2.1 这种浑浊或薄雾的范围可以从几乎看不见到不透明。 5.3 该测试方法提供了一种客观的分析手段，用于提供雾度等级，该雾度等级不依赖于通常随操作者和照明条件而变化的主观视觉等级。

1.1 This test method covers a spectroscopic procedure for determining the level of suspended water and particulate contamination (haze) in liquid middle distillate fuels including those blended with synthesized hydrocarbons or biofuels. 1.1.1 An ordinal, whole-number, Instrument Haze Rating (IHR) from 1 to 6 and a Haze Clarity Index (HCI) from 50.0 to 100.0 are determined on a test specimen at a temperature of 22.0 °C ± 2.0 °C. 1.1.1.1 The stated precision only applies at this temperature. 1.1.1.2 Fuels analyzed at other test specimen temperatures may not be as precise. 1.2 The values stated in SI units are to be regarded as standard. Other units of measurement included in this standard are defined in Section 3 . 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 It has long been the practice to include in fuel specifications a requirement that the fuel is clear and bright. 5.2 One primary cause for failure to meet this specification requirement is the occurrence of a cloudy or hazy appearance caused by suspended solid particulates or water or some combination of both. 5.2.1 This cloudiness or haze can range from barely visible to opaque. 5.3 This test method provides an objective analytical means for providing a haze rating that does not depend on subjective visual ratings that typically vary with operator and lighting conditions.