1.1 本试验方法规定了使用膨胀计测量烟煤膨胀的程序。 1.2 试验方法仅适用于具有自由膨胀指数的煤 ≥ 1根据试验方法测定 D720型 . 1.3 单位- 以国际单位表示的数值视为标准值。SI单位后括号中给出的值仅供参考，不视为标准值。 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（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====== 5.1 煤的膨胀特性值可用于预测或解释煤或混合物在碳化或气化、液化和燃烧等其他过程中的行为。

1.1 This test method specifies a procedure for the measurement of the swelling of bituminous coal using a dilatometer. 1.2 The test method is limited in applicability to those coals which have a free swelling index ≥ 1 as determined in accordance with Test Method D720 . 1.3 Units— The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units 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 ====== 5.1 Values of the dilatation properties of coals may be used to predict or explain the behavior of a coal or blends during carbonization or in other processes such as gasification, liquefaction, and combustion.