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The Wall And Ceiling Of The Project Lecture Hall Of Hebei Yanda Lu Daopei Hospital Use Fireproof A-Level, Environmentally Friendly E-Level Sandstone Sound-Absorbing Board And Sound-Absorbing Paint Produced By Foshan Shangnanyin Technology Co., Ltd. Sandstone Sound-Absorbing Board Has High Acoustic Performance, Which Has The Advantages Of Sound Absorption, Light Absorption, Flame Retardant, Non-Slip, Warm In Winter And Cool In Summer, Moisture Absorption, Cold Resistance, Damage Resistance, No We