1.1 本规范涵盖通过热浸镀工艺涂覆的金属钢板和用于暴露在外的建筑产品的涂有有机膜的卷材。此名称的板材按卷材、切割长度和成型切割长度提供。建筑产品包括波纹和各种类型的辊和制动成型配置。 1.2 基材可用于多种不同的金属涂层钢板产品，如中所述 4.1 ，取决于购买者的要求。 1.3 根据本规范提供的涂层系统包括由各种类型和厚度的面漆覆盖的底漆。底漆和面漆的组合可分为两层薄膜系统或两层（或多层）厚膜系统。典型的面漆材料有:聚酯、有机硅聚酯、丙烯酸、含氟聚合物、增塑溶胶或聚氨酯。 1.4 本规范适用于英寸磅单位（如A755）或国际单位制（如A755M]）的订单。 英寸磅单位和国际单位制的数值不一定相等。在文本中，国际单位制显示在括号中。每个系统应相互独立使用。 1.5 除非订单规定了“M”名称（国际单位制），否则产品应采用英寸磅单位。 1.6 本规范的文本引用了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应被视为本规范的要求。 1.7 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。 1.8 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 steel sheet metallic coated by the hot-dip process and coil-coated with organic films for exterior exposed building products. Sheet of this designation is furnished in coils, cut lengths, and formed cut lengths. Building products include corrugated and various types of roll and brake-formed configurations. 1.2 The substrate is available in several different metallic-coated steel sheet products as enumerated in 4.1 , depending on the requirements of the purchaser. 1.3 Coating systems supplied under this specification consist of a primer coat covered by various types and thicknesses of top coats. The combination of primer and top coat is classed as either a two-coat thin-film system or as a two-coat (or more) thick-film system. Typical top-coating materials are: polyester, silicone polyester, acrylic, fluoropolymer, plastisol, or polyurethane. 1.4 This specification is applicable to orders in either inch-pound units (as A755) or SI units [as A755M]. Values in inch-pound units and SI units are not necessarily equivalent. Within the text, SI units are shown in brackets. Each system shall be used independently of each other. 1.5 Unless the order specifies the “M” designation (SI units), the product shall be furnished to inch-pound units. 1.6 The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes, excluding those in tables and figures, shall not be considered as requirements of this specification. 1.7 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. 1.8 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.