1.1 本程序旨在标准化测量棒球和垒球恢复系数（COR）的方法。 1.2 建立本规程是为了提供单一、可重复和统一的检测方法。 1.3 此程序适用于用于棒球或垒球比赛的球。 1.4 测试方法基于撞击两个测试表面（木材或金属）之前和之后的球速测量。 1.5 以SI单位表示的值应被视为标准。括号中给出的值仅供参考。 1.6 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。1.7 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 球恢复系数是由刚性壁面撞击引起的相对速度变化的球动力学性质。 5.2 该测试方法适用于研究开发、质量控制和按活泼度对球进行分类中的数据获取。 5.3 体育协会可以在官方棒球和垒球的规范中使用归还系数标准。 5.4 该相同的测试程序可以在本程序中规定的冲击速度以外的冲击速度下使用，并在任何报告的测试结果中注明。

1.1 This procedure is intended to standardize a method of measuring the coefficient of restitution (COR) of baseballs and softballs. 1.2 This procedure is established to provide a single, repeatable, and uniform test method. 1.3 This procedure is for a ball that is intended for use in the game of baseball or softball. 1.4 The test method is based on ball speed measurements before and after impact with either of two test surfaces: wood or metal. 1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.6 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. 1.7 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 The ball coefficient of restitution is a ball dynamic property of relative velocity change caused by impact with a rigid wall. 5.2 This test method is suitable for obtaining data in research and development, quality control, and classifying balls by liveliness. 5.3 Sports associations can use coefficient of restitution standards in specifications for official baseballs and softballs. 5.4 This same test procedure can be utilized at impact speeds other then that prescribed in this procedure and so noted in any reported test results.