1.1 本规范规定了由硬质（未增塑）PVC化合物制成的挤压单壁拱腹的材料、尺寸、拱度、冲击强度、膨胀和外观的要求和试验方法。还提供了指示符合本规范的方法。 1.2 本产品中PVC再生塑料的使用应符合第节的要求 4. . 1.3 根据本规范生产的拱腹应按照制造商针对要安装的特定产品的安装说明进行安装。 注1: 有关拱腹维护的信息应从制造商处获得。 1.4 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.5 以下注意事项仅适用于本规范第6节中的试验方法部分。 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 注2: 目前还没有与该标准等效的ISO。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《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。

1.1 This specification establishes requirements and test methods for the materials, dimensions, camber, impact strength, expansion, and appearance of extruded single-wall soffit manufactured from rigid (unplasticized) PVC compound. Methods of indicating compliance with this specification are also provided. 1.2 The use of PVC recycled plastic in this product shall be in accordance with the requirements in Section 4 . 1.3 Soffit produced to this specification shall be installed in accordance with the manufacturer's installation instructions for the specific product to be installed. Note 1: Information with regard to soffit maintenance shall be obtained from the manufacturer. 1.4 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. 1.5 The following precautionary caveat pertains to the test method portion only, Section 6 of this specification. 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. Note 2: There is no known ISO equivalent to this standard. 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.