Bond the sound-absorbing board is the application of resonance absorption, friction acoustic principle in the composite perforation plate at the back of the cavity of pad put a layer of inorganic fiber composite plate acoustical body, absorption frequency wider (100-5000 hz); The absorption coefficient is higher (0.5-0.82) are widely used in industrial workshop condole top reduce noise, improve working conditions, and can control to eliminate echo, improve the quality of the voice.