1.1 该分类涵盖了在建筑中提供声学性能和内部装饰的天花板产品。在某些情况下，用于性能空间和其他特殊应用的产品需要比该分类提供的更详细的规范。 1.2 该分类按类型、图案和声学性能、光反射率和消防安全的某些等级对吸音天花板进行分类。当用作测试耐火性或地板/天花板声音传输的系统或组件的组件时，它不包括声学天花板的各个方面。 1.3 该分类不包括影响吸音天花板产品的搬运、安装和使用的物理特性，如结构硬度、脆性、下垂、线性膨胀和收缩以及横向强度（见试验方法 C367 )。 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 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。 ====意义和用途====== 4.1 该分类用于对吸音天花板产品进行分类和帮助选择。

1.1 This classification covers ceiling products that provide acoustical performance and interior finish in buildings. Products used in performance spaces and other special applications in some cases require more detailed specification than provided by this classification. 1.2 This classification classifies acoustical ceilings by type, pattern, and certain ratings for acoustical performance, light reflectance, and fire safety. It does not cover the aspects of acoustical ceilings when used as a component of a system or assembly tested for fire endurance or floor/ceiling sound transmission. 1.3 This classification does not include physical properties, such as structural hardness, friability, sag, linear expansion and contraction, and transverse strength, which affect the handling, installation, and use of acoustical ceiling products (see Test Methods C367 ). 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 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 This classification is used to classify and aid in the selection of acoustical ceiling products.