1.1 本规范涵盖用于外部应用的无纹理或表面纹理纤维水泥平板，如墙面覆层、外墙、幕墙、拱腹等。 1.2 本规范不适用于石棉水泥平板（规范 C220 )，石膏板（规范 C1396/C1396M ， C1177/C1177M ， C1178/C1178M )，或刨花板（术语 D1554 )离散型非石棉纤维水泥内部基板（规范 C1288 )纤维毡增强非石棉水泥内部基板（规范 C1325 )，或水泥粘合刨花板（规范BS 5669:第4部分）和（ISO 8335）。 1.3 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。 1.4 本标准的文本引用了提供解释性材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应被视为本标准的要求。 1.5 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 covers either untextured or surface textured fiber-cement flat sheets intended for exterior applications such as wall claddings, facades, curtain walls, soffits, and so forth. 1.2 This specification is not applicable to asbestos-cement flat sheets (Specification C220 ), gypsum-based boards (Specifications C1396/C1396M , C1177/C1177M , C1178/C1178M ), or particle boards (Terminology D1554 ) discrete non-asbestos fiber-cement interior substrate sheets (Specification C1288 ), fiber-mat reinforced non-asbestos cement interior substrate sheets (Specification C1325 ), or cement-bonded particleboards (Specification BS 5669: Part 4) and (ISO 8335). 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 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 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.