1.1 本试验方法包括通过45-μm（325号）筛测定水硬性水泥的细度。 1.1.1 本试验方法可用于测定其他材料的细度。然而，某些要求，如校准程序、筛网清洁和测试结果解释，可能不适用于水硬性水泥以外的材料。 1.2 以国际单位制表示的值应被视为标准。国际单位制的英寸磅当量可能是近似值。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、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。

1.1 This test method covers the determination of the fineness of hydraulic cement by means of the 45-μm (No. 325) sieve. 1.1.1 This test method may be used for the determination of the fineness of other materials. However, certain requirements, such as calibration procedures, cleaning of sieves, and interpretation of the test results, may be not be appropriate for materials other than hydraulic cement. 1.2 The values stated in SI units are to be regarded as the standard. The inch-pound equivalents of SI units may be approximate. 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.