1.1 本试验方法包括使用丝网筛测定非塑性陶瓷粉末的粒度分布，如氧化铝、二氧化硅、长石、叶蜡石、霞石正长岩、滑石、钛酸盐和锆石。 1.2 在进行试验之前，对含有大量细粒、含有团聚体或不自由流动的材料进行湿法筛分，以去除过多的细粒或分散团聚体。该技术不适用于在任何程度上都是水溶性的材料。 1.3 以国际单位制表示的数值应视为标准。括号中给出的值是对英寸的数学转换- 磅单位，或其他常用单位（在筛框直径和筛号的情况下），仅供参考，不被视为标准单位。 1.4 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。 1.5 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====== 3.1 进行筛分分析以确定粉末的粒度分布，进而用于鉴定这些材料在所考虑的工艺中的有用性。由于粒度分析只有相对意义，因此仅当其与工艺特征相关时才应考虑结果。本试验中测量的参数是通过具有理论方形开口的布料的材料量。必须记住，所有的洞都不是正方形的，大小也不均匀，给定粒子是否会穿过的问题是一个统计问题。 由于每种粒度分析方法都测量一个独特的物理参数，因此一种方法的结果可能与另一种方法不一致。颗粒尺寸分布对堆积密度、含尘量和处理特性等特性起着重要作用。然而，当从分布曲线上的一个或两个点（筛网）进行解释时，应注意。

1.1 This test method covers the determination of the particle size distribution of nonplastic ceramic powders such as alumina, silica, feldspar, pyrophyllite, nepheline syenite, talc, titanates, and zircon using wire cloth sieves. 1.2 Materials containing a large amount of fines, containing agglomerates, or that are nonfree-flowing, are wet-sieved to remove excessive fines or to disperse agglomerates before performing the test. This technique is not applicable to materials that are, to any degree, water soluble. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units, or are other customary units (in the case of sieve frame diameter and sieve number), that are provided for information only and are not considered 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. 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 ====== 3.1 Sieve analyses are carried out to determine the particle size distribution of powders which, in turn, are used to qualify those materials as to their usefulness in the process under consideration. Since particle size analyses have only relative significance, the results should be considered only where they correlate with process characteristics. The parameter that is being measured in this test is the amount of material that will pass through a cloth having theoretically square openings. It must be remembered that all the holes are not square, nor uniform in size, and the question of whether a given particle will go through is a statistical one. Since each particle size analysis method measures a unique physical parameter, the results from one method may not agree with those from another. Particle size distributions play a role in such properties as bulk density, dustiness, and handling characteristics. Care should be taken, however, when interpretations are made from one or two points (sieves) on the distribution curve.