1.1 这一分类涵盖了通过抹子或喷涂在表面上以增加吸声的材料。 1.2 以国际单位表示的数值视为标准值。本标准不包括其他计量单位。 1.3 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 吸声材料用于控制房间内的混响和回声。 本标准提供了通过抹子或喷涂直接应用于表面的吸声材料的分类方法。

1.1 This classification covers materials applied by trowel or spray to surfaces for the purpose of increasing their acoustical absorption. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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 Acoustically absorptive materials are used for the control of reverberation and echoes in rooms. This standard provides a classification method for acoustically absorptive materials applied directly to surfaces by trowel or by spray.