1.1 这些试验方法测量含有伯羟基和仲羟基的聚酯和聚醚多元醇中的羟基。它们也适用于许多其他含羟基物质。 1.1.1 试验方法A-A乙酸酐压力瓶， 推荐用于聚酯。 1.1.2 测试方法B-邻苯二甲酸酐压力瓶， 建议用于聚醚和聚酯。 1.1.3 测试方法C-邻苯二甲酸酐回流， 建议用于聚醚和聚酯。 1.1.4 试验方法D-咪唑催化邻苯二甲酸酐压力瓶， 推荐用于聚醚、聚酯、聚合物多元醇和胺引发的多元醇。 1.1.5 试验方法E- 咪唑催化均苯二甲酸二酐酯化反应 ，推荐用于柔性和刚性聚氨酯泡沫和聚氨酯弹性体的多元醇。建议用于聚酯多元醇、聚醚多元醇、胺- 起始多元醇和聚合物多元醇（聚丙烯腈/共聚苯乙烯基）。 1.2 另一种ASTM测量羟基的测试方法是测试方法 第222页 . 1.3 以国际单位制表示的数值应视为标准。 1.4 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，ISO 14900和ISO 6796涉及相同的主题，但在技术内容上有所不同。 1.5 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 这些测试方法适用于研究以及质量控制和规范测试。为了配制聚氨酯体系，有必要了解多元醇的羟基含量。

1.1 These test methods measure the hydroxyl groups in polyester and polyether polyols containing primary and secondary hydroxyl groups. They also apply to many other hydroxyl-containing substances. 1.1.1 Test Method A—Acetic Anhydride Pressure Bottle, recommended for polyesters. 1.1.2 Test Method B—Phthalic Anhydride Pressure Bottle, recommended for polyethers and polyesters. 1.1.3 Test Method C—Phthalic Anhydride Reflux, recommended for polyethers and polyesters. 1.1.4 Test Method D—Imidazole–Catalyzed Phthalic Anhydride Pressure Bottle, recommended for polyethers, polyesters, polymer polyols, and amine-initiated polyols. 1.1.5 Test Method E— Imidazole-Catalyzed Pyromellitic Dianhydride Esterification , recommended for polyols used for flexible and rigid polyurethane foams and urethane elastomers. It is recommended for polyester polyols, polyether polyols, amine-started polyols, and polymer polyols (polyacrylonitrile/copolystyrene-based). 1.2 Another ASTM test method for measuring hydroxyl groups is Test Method E222 . 1.3 The values stated in SI units are to be regarded as the 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 1: This standard, ISO 14900 and ISO 6796 address the same subject matter, but differ in technical content. 1.5 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 These test methods are suitable for research and as quality control and specification tests. It is necessary to know the hydroxyl contents of polyols in order to formulate polyurethane systems.