1.1 本实施规程涵盖了通过tup（落锤）在规定的冲击条件下测定热塑性管道和配件的抗冲击性。tup上使用了三个可互换的撞击鼻，几何构型不同。描述了两种样品保持器。 附注1: 附录X1 显示了确定冲击强度的程序。 1.2 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。 1.3 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。1.4 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====== 4.1 热塑性管道和配件的抗冲击性与服务适用性和加工质量有关。抗冲击性还可以提供材料在处理和安装期间的抗破损性的相对测量，以及对于非掩埋应用，抗使用中的抗破损性的相对测量。看 附录X5 选择测试组合的指南。 4.2 通过使用该实践获得的结果可以以三种方式使用:4.2.1 作为产品标准中建立冲击试验要求的依据， 4.2.2 衡量材料或工艺变化的影响，以及 4.2.3 来衡量环境的影响。

1.1 This practice covers the determination of the impact resistance of thermoplastic pipe and fittings under specified conditions of impact by means of a tup (falling weight). Three interchangeable striking noses are used on the tup, differing in geometrical configuration. Two specimen holders are described. Note 1: Appendix X1 shows the procedure to determine impact strength. 1.2 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. 1.3 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. 1.4 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 ====== 4.1 The impact resistance of thermoplastic pipe and fittings relates to suitability for service and to quality of processing. Impact resistance may also provide a relative measure of a material's resistance to breakage during handling and installation and, for non-buried applications, to in-service breakage. See Appendix X5 for guidelines for selecting testing combinations. 4.2 Results obtained by use of this practice can be used in three ways: 4.2.1 As the basis for establishing impact test requirements in product standards, 4.2.2 To measure the effect of changes in materials or processing, and 4.2.3 To measure the effect of the environment.