1.1 本试验方法涵盖了使用筛分仪测定催化粉末材料的粒度分布，是对粒度测量有价值的几种方法之一。该试验方法特别适用于20至420μ μm范围内。（见术语 D3766电话 .) 1.2 单位- 以国际单位表示的数值视为标准值。本标准不包括其他计量单位。 1.2.1 例外情况- 在里面 5.2 ，网目尺寸为标准计量单位。 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。 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====== 4.1 该试验方法可用于确定催化剂和载体的粒度分布，用于材料规范、制造控制和研发工作。

1.1 This test method covers the determination of particle size distribution of catalytic powder material using a sieving instrument and is one of several found valuable for the measurement of particle size. This test method is particularly suitable for particles in the 20 to 420 μm range. (See Terminology D3766 .) 1.2 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1 Exception— In 5.2 , mesh size is the standard unit of measure. 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 ====== 4.1 This test method can be used to determine particle size distributions of catalysts and supports for materials specifications, manufacturing control, and research and development work.