1.1 本试验方法涵盖在20℃至20℃的温度下测量1.3300至1.5000范围内透明和浅色碳氢化合物的折射率，精确到小数点后四位或更高 °C至30 °C通过手动（光学机械）或自动（数字）程序。 1.2 手动（光学机械）程序还包括精确到小数点后四位或更高的折射色散测量。 注1: 该试验方法可适用于测量1.5000以上和20以下温度下液体的折射率 摄氏度及以上30 °C；然而，试验方法精度可能不适用。此类测量准确度的验证将取决于可靠、经认证的参考标准的可用性，这些标准可证明在特定测量条件下使用的仪器的性能。 1.3 本试验方法可能不适用于颜色强烈的液体，或起泡点接近试验温度，以至于在发生实质性风化之前无法获得读数的液体。 液体颜色应限制为4号ASTM颜色或较浅的颜色，由试验方法确定 D1500 . 1.4 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。 1.5 警告 -许多监管机构已将汞指定为一种危险物质，可导致严重的医疗问题。汞或其蒸汽已被证明对健康有害，并对材料具有腐蚀性。处理汞和含汞产品时要小心。有关更多信息，请参阅适用的产品安全数据表（SDS）。当地或国家法律禁止销售汞或含汞产品，或两者兼有。用户必须确定其所在地销售的合法性。 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 折射率和折射色散是基本的物理性质，可以与其他性质一起用于表征纯碳氢化合物及其混合物。

1.1 This test method covers the measurement of refractive index, accurate to four decimal places or better, of transparent and light-colored hydrocarbons in the range of 1.3300 to 1.5000 at temperatures from 20 °C to 30 °C by manual (optical-mechanical) or automatic (digital) procedure. 1.2 The manual (optical-mechanical) procedure also covers the measurement of refractive dispersion accurate to the fourth decimal place or better. Note 1: The test method may be suitable for measuring the refractive indices of liquids above 1.5000 and at temperatures both below 20 °C and above 30 °C; however, the test method precision may not apply. Verification of the accuracy of such measurements will depend upon the availability of reliable, certified reference standards that demonstrate the performance of the instrument used under the particular measuring conditions. 1.3 The test method may not be applicable to liquids that are strongly colored, or that have bubble points so near the test temperature that a reading cannot be obtained before substantial weathering takes place. Liquid color should be limited to No. 4 ASTM Color or lighter, as determined by Test Method D1500 . 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 WARNING —Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use Caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location. 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 Refractive index and refractive dispersion are fundamental physical properties, which can be used in conjunction with other properties to characterize pure hydrocarbons and their mixtures.