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Centrifugal glass wool belonging to the porous sound-absorbing material with good acoustic performance. Centrifugal sound-absorbing glass wool can not due to surface roughness, but because a large number of internal and external communication of tiny pores and cavities. When sound waves incident on the glass wool, glass wool for sound absorption in a better high-frequency performance. The main factors affecting the centrifugal glass wool sound absorption performance is the thickness, density and air flow resistance and the like. Density is the weight per cubic meter of material. Than the material side air pressure and air flow resistance is the unit thickness of the air flow. Air flow resistance is the most important factor in centrifugal glass wool sound absorption performance impact. Flow resistance is too small, sparse explanatory material, easily pass through the air vibration, acoustic performance degradation; flow resistance is too large, explanatory material dense, difficult to incoming air vibration, acoustic performance also dropped. For centrifugal glass wool is concerned, there is an optimum flow resistance, sound absorption properties. In practical engineering, measuring the air flow resistance is difficult, but can be roughly estimated by the thickness and density and control. 1, with the increase of thickness, the low frequency absorption coefficient significantly increased, but little change in the high-frequency (high-frequency absorption is always larger). 2, the same thickness, density increases, the low frequency sound absorption coefficient also increased; but when the density increases to a certain degree, the material becomes dense, flow resistance is greater than optimum flow resistance, sound absorption coefficient decreased. For thicker than 5cm bulk density centrifugal glass wool 16Kg / m3, and 125Hz low frequency of about 0.2, the high-frequency (> 500Hz) of the absorption coefficient is close to 1 up. When the thickness continues to increase by the 5cm, low-frequency sound absorption coefficient gradually increased, when the thickness is greater than 1m or more, 125Hz low frequency sound absorption coefficient will also be close to unity.