1.1 本试验方法包括测定脂肪族和环状化合物及苯酚中附着在初级和次级碳原子上的羟基。它不适用于测定附着在第三碳原子上的羟基。本试验方法适用于聚缩醛、温度敏感材料、高固体分聚合物多元醇和刚性多元醇。中列出的其他可用测试方法 注1 不适用于上面列出的许多样本类型。 1.1. 1. 该试验方法目前推荐用于中性精制产品。然而，已成功应用于一些含有过量酸性物质的过程中样品。当然，必须进行适当的验证，以表明酸性物质或不干扰，或酸性物质干扰已被消除。 注1: 测试方法中给出了测定羟基的其他方法 D817 , D871 , D1957 , D2195 , D4252 , D4273 , D4274 , E222页 , E326 和 E335 . 1.2 查看当前适当的安全数据表（SDS），了解有关毒性、急救程序和安全预防措施的详细信息。 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 本标准无意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和健康实践，并确定监管限制的适用性。 有关具体危险，请参阅第节 9 . ====意义和用途====== 5.1 羟基是一个重要的官能团，在许多中间和最终用途中需要了解其含量。本试验方法用于测定初级和次级羟基，并可用于测定含有它们的化合物。 5.2 与其他羟值方法相比，该测试方法具有以下优点:快速（10分钟），无吡啶，环境温度，样本量小，适用于极低的羟值（<1），并且易于自动化。

1.1 This test method covers the determination of hydroxyl groups attached to primary and secondary carbon atoms in aliphatic and cyclic compounds and phenols. It is not suitable for determination of hydroxyl groups attached to tertiary carbon atoms. This test method is applicable to polyacetals, temperature sensitive materials, high solids polymer polyols, and rigid polyols. Other available test methods listed in Note 1 are not suitable for many of the sample types listed above. 1.1.1 This test method is currently recommended for neutral refined products. Successful application has been made, however, to some in-process samples that contain an excess of acidic species. Proper validation must be performed, of course, to show that the acidic species either does not interfere, or that the acidic species interference has been obviated. Note 1: Other methods for determination of hydroxyl groups are given in Test Methods D817 , D871 , D1957 , D2195 , D4252 , D4273 , D4274 , E222 , E326 , and E335 . 1.2 Review the current appropriate Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, and safety precautions. 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 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific hazards see Section 9 . ====== Significance And Use ====== 5.1 Hydroxyl is an important functional group and knowledge of its content is required in many intermediate and end use applications. This test method is for the determination of primary and secondary hydroxyl groups and can be used for the assay of compounds containing them. 5.2 This test method has the following advantages over other hydroxyl number methods: It is rapid (10 min), pyridine-free, ambient temperature, small sample size, applicable to extremely low hydroxyl numbers (<1), and is amenable to automation.