1.1 本试验方法包括测量氧化镁颗粒对水合作用的相对阻力。 1.2 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 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 本试验方法测定氧化镁颗粒的相对水化阻力。 3.2 该测试方法在工业中用于评估谷物样品，在某些情况下用于规范目的。 3.3 在解释数据时必须小心谨慎。

1.1 This test method covers the measurement of the relative resistance of magnesia grain to hydration. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI 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 ====== 3.1 This test method determines relative hydration resistance of magnesia grain. 3.2 This test method is used in industry to evaluate grain samples and is used for specification purposes in some cases. 3.3 Care must be taken in interpreting the data.