1.1 本实施规程描述了根据试验方法获得的试验数据建立冲击试验要求的程序 D2444 . 1.2 本规范适用于热塑性管道和配件。 1.3 以英寸-磅单位表示的值应被视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准。 1.4 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。 1.5 本国际标准是根据世界贸易组织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技术性贸易壁垒委员会。 ======意义和用途====== 5.1 本惯例用于起草冲击试验规范要求，并不以特别熟悉统计方法为前提。它提供的质量标准值将以高度的确定性通过可接受的批次。冲击试验要求旨在区分可接受的材料和制造方法与不可接受的材料和制造方法；它不是模拟服务测试。

1.1 This practice describes a procedure for setting up impact test requirements on the basis of test data obtained by Test Method D2444 . 1.2 This practice is applicable to thermoplastic pipe and fittings. 1.3 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. 1.4 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 This practice is used for drafting impact test specification requirements, and it presupposes no special familiarity with statistical methods. It provides for specification values that will pass acceptable lots with a high degree of certainty. The impact test requirement is intended to discriminate between acceptable materials and manufacturing methods and those which are not; it is not a simulated service test.