1.1 本试验方法涵盖了在规定的时间和温度条件下，对顺酐熔体在长时间加热前后的颜色进行CIE（Commission International de l'Eclairage）三色刺激测量的仪器方法。测量值转换为铂钴系统中的颜色值。 1.2 本试验方法涵盖0至100 Pt Co颜色范围。 1.3 在使用该方法确定测试结果是否符合适用规范时，应根据实践中的四舍五入方法对结果进行四舍五入 E29年 . 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 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。有关具体的危险说明，请参阅第节 7. , 10.3 和 10.6 . 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====== 4.1 顺丁烯二酸酐的颜色可以指示这些材料的纯度。加热后的高颜色通常表示污染或分解。 4.2 本标准适用于过程质量控制和确定产品是否符合规范。

1.1 This test method covers an instrumental method for the CIE (Commission International de l’Eclairage) tristimulus measurement of the color of maleic anhydride melt before and after prolonged heating under specified conditions of time and temperature. The measurement is converted to color values in the platinum-cobalt system. 1.2 This test method covers the range 0 to100 Pt-Co color. 1.3 In determining the conformance of the test results using this method to applicable specification, results shall be rounded in accordance with the rounding off methods of Practice E29 . 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 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. For specific hazard statements, see Sections 7 , 10.3 , and 10.6 . 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 ====== 4.1 The color of maleic anhydride can be an indication of the purity of these materials. A high color after heating normally indicates contamination or decomposition. 4.2 This standard is suitable for process quality control and determining if the product meets specifications.