1.1 本试验方法为跌落破碎试验 2. 包括测定相对粒度稳定性及其补充，粒度煤的易碎性。它提供了一种指示煤炭在矿山搬运和运输至消费者期间承受破碎能力的方法。该试验方法可用于确定煤在粒度稳定性和易碎性方面的相似性，而不是在狭窄范围内确定值，以强调其差异性。本试验方法被认为适用于测试选定的不同煤种的单一粒度，测试相同煤种的不同单一粒度，以及相同或不同煤种的混合粒度。 注1: 单粒径是指具有固定筛孔上限和下限的筛孔，从中选择 4.2 ; 混合尺寸是指“松弛”或两种或两种以上单一尺寸的混合。 1.2 本试验方法似乎最适合测量薄层搬运时较大尺寸煤炭的相对抗破碎性，如从装载机到矿车、从装载臂到铁路车、从电铲到溜槽等。但它可能不太适合测量大规模搬运时煤炭的破碎性，如露天卸煤- 底车、卸料仓等，相信该试验方法也将用于指示复合粒度煤的相对粒度稳定性，其中在商业处理中，较小粒度的煤具有缓冲作用，可减少较大煤块的破碎。 1.3 以英寸-磅为单位的数值应视为标准值。质量可以用公制值表示。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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====== 3.1 当根据其他煤炭的相关经验进行评估时，本试验方法中确定的值可用于指示煤炭在常规运输和处理过程中超出取样点的破碎程度。

1.1 This test method of drop shatter test 2 covers the determination of the relative size stability and its complement, the friability, of sized coal. It affords a means of indicating the ability of coal to withstand breakage when subjected to handling at the mine and during transit to the consumer. The test method is serviceable for ascertaining the similarity of coals in respect to size stability and friability rather than for determining values within narrow limits in order to emphasize their dissimilarity. This test method is considered applicable for testing a selected single size of different coals, for testing different single sizes of the same coal, and for mixed sizes of the same or different coals. Note 1: By single sizes, it is meant those with fixed upper and lower sieve opening limits, selected from those designated in 4.2 ; and by mixed sizes, it is meant either “slack” or a mixture of two or more single sizes. 1.2 This test method appears best suited for measuring the relative resistance to breakage of the larger sizes of coal when handled in thin layers such as from loader to mine car, from loading boom to railroad car, from shovel to chute, etc. While it may not be so well adapted for measuring the liability to breakage of coal when handled in mass, as in unloading open-bottom cars, emptying bins, etc., it is believed that the test method will serve also to indicate the relative size stability of composite sizes of coal where, in commercial handling, the smaller sized pieces have a cushioning effect which tends to lessen the breakage of the larger pieces of coal. 1.3 The values stated in inch-pound units shall be regarded as the standard. Mass may be expressed in metric values. 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 The values determined in this test method, when evaluated in terms of pertinent experience with other coals, may be used as indications of the extent to which coal will break in conventional transit and handling beyond the point of sampling.