1.1 这些测试方法包括测定粉末离子交换树脂的物理和化学性质，并用于测试新材料。包括以下试验方法: 小节 试验方法A-粒度分布 5. 到 15 试验方法B-固体含量 16 到 23 1.2 以国际单位制表示的数值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。 1.3 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。 1.4 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====== 7.1 粉末离子交换树脂的粒径分布，更重要的是，平均粒径和高于或低于规定粒径限制的百分比的衍生参数，有助于确定批次间的变化，在某些情况下，可能与产品性能的某些方面有关。 7.2 尽管自动多通道粒度分析仪属于第节中描述的类型 9 ，获得了给定样品中存在的整个粒度分布的信息，已经发现，对于这种应用，三个衍生参数的数值可以充分描述样品的粒度特征: 平均粒径（以微米为单位）、低于某个尺寸限制的样本百分比以及高于某个尺寸限制的样本百分比。

1.1 These test methods cover the determination of the physical and chemical properties of powdered ion exchange resins and are intended for use in testing new materials. The following test methods are included: Sections Test Method A—Particle Size Distribution 5 to 15 Test Method B—Solids Content 16 to 23 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered 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. 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 ====== 7.1 The particle size distribution of powdered ion exchange resins and, more importantly, the derived parameters of mean particle size and percent above and below specified size limits are useful for determining batch to batch variations and, in some cases, can be related to certain aspects of product performance. 7.2 Although automatic multichannel particle size analyzers, of the type described in Section 9 , yield information on the entire distribution of sizes present in a given sample, it has been found that, for this application, the numerical value of three derived parameters may adequately describe the particle size characteristics of the samples: the mean particle diameter (in micrometres), the percent of the sample that falls below some size limit, and the percent of the sample that falls above some size limit.