1.1 本试验方法测量了可溶于冰醋酸并能与高氯酸反应的多元醇中的基本成分。含有0.3的样品 % 至10 % 用这种方法对氮进行了评价。本试验方法适用于聚氨酯反应中使用的聚醚多元醇和聚醚多元醇混合物。看见 注1 .) 1.2 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。 本标准的使用者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。 注1: 本标准等同于ISO 25761:08. 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《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 该测试方法适用于质量控制、规范测试和研究。该结果是批次间均匀性的测量结果，可用于估计反应性。 5.1.1 氮百分比可用于表征多元醇或指示多元醇混合物中某些组分的量。 5.1.2 如果需要，也可以用每克样品的碱当量表示结果。

1.1 This test method measures the basic constituents in polyols that are soluble in glacial acetic acid and reactive with perchloric acid. Samples containing 0.3 % to 10 % nitrogen have been evaluated by this method. This test method is applicable to polyether polyols and polyether polyol blends that are used in urethane reactions. (See Note 1 .) 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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. Note 1: This standard is equivalent to ISO 25761:08. 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 This test method is suitable for quality control, as a specification test, and for research. The results are measures of batch-to-batch uniformity and are useful in estimating reactivity. 5.1.1 The percent nitrogen can be used to characterize a polyol or indicate amounts of certain components in a polyol blend. 5.1.2 It is permissible to also express the results in equivalents of base per gram of sample, if desired.