1.1 本规程涵盖了当膜和基材因冲击而膨胀超过其原始形状时，确定涂层及其基材抗破碎、开裂或碎裂能力的程序。 1.2 本规程不测量抗冲击性，但使用快速冲击来改进试验方法 D522 ，一种灵活性测试方法。由于涂层的影响几乎是瞬时的，因此消除了芯轴试验中与时间变量相关的所有问题。 1.3 该实践在内容上类似，但在技术上不等同于试验方法 D2794 . 1.4 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.5 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。 1.6 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 附着在基材上的涂层在物品制造及其使用过程中受到破坏性冲击。 这种抗冲击实践对于预测有机涂层的性能非常有用，因为它们能够抵抗冲击引起的开裂。

1.1 This practice covers a procedure for determining the ability of a coating film and its substrate to resist shattering, cracking, or chipping when the film and substrate are distended beyond their original form by impact. 1.2 This practice does not measure impact resistance but uses rapid impact to improve Test Methods D522 , a test method for flexibility. Since the impact of the coating is almost instantaneous, all of the problems associated with time variables in the mandrel tests are eliminated. 1.3 This practice is similar in content but not technically equivalent to Test Method D2794 . 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 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. 1.6 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 Coatings attached to substrates are subjected to damaging impacts during the manufacture of articles and their use in service. This impact resistance practice has been found to be useful in predicting the performance of organic coatings for their ability to resist cracking caused by impacts.