the porous sound-absorbing material, have good sound-absorbing performance. Centrifugal glass cotton can sound-absorbing reason is not due to rough surface, but because a large number of internal and external connecteCentrifugal glass cotton belongs to d tiny pore and holes. When sound waves transmits centrifugal glass cotton, sound waves can follow pore into material interior, cause voids air molecules vibration. Due to the air of viscous resistance and air molecules and pore wall friction, sound energy into heat energy losses.