1.1 本试验方法包括测量折射率在1.33至1.60之间、温度为80℃的透明和浅色粘稠烃类液体和熔融固体的折射率，精确到小数点后四位两个单位 °C至100 °C.温度低于80 如果样品的熔点至少为10℃，则可以使用°C °C低于试验温度。 1.2 在规定的精度范围内，本试验方法不适用于颜色比ASTM颜色4深的液体，ASTM颜色由试验方法确定 D1500 ，在试验温度下容易冒烟或蒸发的液体，或在10℃内熔化的固体 试验温度的°C。 注1: 该仪器可以成功地用于1.60以上的折射率；但由于1.60以上范围的认证液体标准尚不可用，因此尚未评估这些条件下的测量精度。 1.3 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。 1.4 警告 -环保局和许多国家机构已将汞指定为一种有害物质，可导致中枢神经系统、肾脏和肝脏损害。汞或其蒸汽可能对健康有害，并对材料具有腐蚀性。处理汞和含汞产品时应小心。有关详细信息，请参阅适用的产品材料安全数据表（MSDS）和美国环保局网站（http: //www.epa。gov/mercury/faq。htm）以获取更多信息。用户应意识到，州法律可能禁止在您所在州销售汞或含汞产品，或同时销售两者。 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。 1.6 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 折射率是一种基本的物理性质，可与其他性质一起用于表征纯碳氢化合物及其混合物。 5.2 在测定粘性油和蜡的总成分的相关方法中使用折射率通常需要在高温下进行测量。

1.1 This test method covers the measurement of refractive indexes, accurate to two units in the fourth decimal place, of transparent and light-colored viscous hydrocarbon liquids and melted solids that have refractive indexes in the range between 1.33 and 1.60, and at temperatures from 80 °C to 100 °C. Temperatures lower than 80 °C can be used provided that the melting point of the sample is at least 10 °C below the test temperature. 1.2 This test method is not applicable, within the accuracy stated, to liquids having colors darker than ASTM Color No. 4, ASTM color as determined by Test Method D1500 , to liquids which smoke or vaporize readily at the test temperature, or to solids melting within 10 °C of the test temperature. Note 1: The instrument can be successfully used for refractive indices above 1.60; but since certified liquid standards for ranges above 1.60 are not yet available, the accuracy of measurement under these conditions has not been evaluated. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 Warning —Mercury has been designated by EPA and many state agencies as a hazardous material that can cause central nervous system, kidney, and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury-containing products. See the applicable product Material Safety Data Sheet (MSDS) for details and EPA’s website (http://www.epa.gov/mercury/faq.htm) for additional information. Users should be aware that selling mercury or mercury-containing products, or both, in your state may be prohibited by state law. 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 Refractive index is a fundamental physical property that can be used in conjunction with other properties to characterize pure hydrocarbons and their mixtures. 5.2 The use of refractive index in correlative methods for the determination of the gross composition of viscous oils and waxes often requires its measurement at elevated temperatures.