1.1 本规范适用于塑料木材材料和木塑复合材料的使用，不适用于用作外墙覆盖物和外墙组件一部分的其他塑料复合材料。 1.2 本规范不适用于未用作外墙覆盖物一部分的外墙组件中所含的塑料木材或木塑复合材料的使用。 1.3 本规范不适用于以下任何类型材料的使用: （a） 聚氯乙烯（PVC）墙板（见规范 第3679页 ，用于标准乙烯基墙板，或规范 第7793页 ，用于绝缘乙烯基墙板）， （b） 聚丙烯墙板（见规范 天7254 ), （c） 木材（包括木材、胶合板、工程木材、涂层木材或涂漆木材）。 1.4 本规范不适用于塑料木材材料或木塑复合材料在除 1.1 特别是，本规范不适用于使用塑料木材或木塑复合材料作为外部甲板、楼梯踏板、扶手、防护装置或拱腹。 1.5 以英寸磅为单位的数值应视为标准。括号中给出的任何国际单位制单位仅供参考。 1.6 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1: 目前还没有与该标准等效的ISO。 1.7 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 is applicable to the use of plastic lumber materials and of wood-plastic composite materials, and no other plastic composite materials, used as exterior wall coverings, as part of an exterior wall assembly. 1.2 This specification is not applicable to the use of plastic lumber materials or of wood-plastic composite materials contained in exterior wall assemblies when not used as part of the exterior wall covering. 1.3 This specification is not applicable to the use of any of the following types of materials: (a) poly(vinyl chloride) (PVC) siding (see Specification D3679 , for standard vinyl siding, or Specification D7793 , for insulated vinyl siding), (b) polypropylene siding (see Specification D7254 ), (c) wood (including lumber, plywood, engineered wood, coated wood, or painted wood). 1.4 This specification is not applicable to the use of plastic lumber materials or of wood-plastic composite materials in any application other than the one addressed in 1.1 . In particular, this specification is not applicable to the use of plastic lumber materials or of wood-plastic composite materials as exterior deck boards, stair treads, handrails, guards, or soffits. 1.5 The values stated in inch-pound units are to be regarded as standard. Any SI units 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. Note 1: There is no known ISO equivalent to this standard. 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.