Glass wool board

For more information glass wool board: Centrifugal glass wool fiber fluffy staggered inside, there are a lot of tiny pores, is typical of porous sound-absorbing material, has good sound absorption properties. Centrifugal glass wool can be made into wall, ceiling, space absorber, etc., can absorb a lot of sound energy in the room, reducing the reverberation time, reduce indoor noise. Centrifugal glass wool sound absorption characteristics of not only the thickness and density, but also with factors cover material, structure and so on. In architectural applications taking into account the need to cost, aesthetics, fire, moisture, dust, anti-aging and many other issues. 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, acoustic energy into the interior of the material along the pore, causing the air molecules vibrating space. Since the viscous resistance of air and air molecules and pore wall friction, sound energy into heat energy loss. Centrifugal 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. When the same thickness, bulk density increases, the low frequency sound absorption coefficient glass wool will continue to increase, when the density close to the 110kg / m3 maximum sound absorption performance, 50mm thick, the frequency of 125Hz at the close of 0.6-0.7. When the bulk density of more than 120kg / m3, the sound absorption performance declines and because the material becomes dense, high-frequency sound absorption performance is greatly affected when the bulk density of more than 300kg / m3, the sound absorption performance is reduced a lot. Commonly used in architectural acoustics sound-absorbing glass wool thickness are 2.5cm, 5cm, 10cm, bulk density have 16,24,32,48,80,96,112kg / m3. Usually 5cm thick, centrifugal glass wool 12-48kg / m3 of. Centrifugal glass wool sound absorption performance and installation conditions also have a close relationship. When the glass wool board air layer behind the product, similar to the same thickness of glass wool board without air layer absorption effect. Especially in the low-frequency sound absorption performance than the material posted solid hard bottom surface is significantly increased, absorption coefficient increases with increasing thickness of the air layer, but to a certain value effect is not obvious. Using different density of glass wool and stacked together to form a bulk density increases in the form of greater absorption effect can be obtained. For example, a layer of 2.5cm thick 24kg / m3 and a layer of cotton board 2.5cm thick 32kg / m3 of cotton plate stack and absorption together better than 5cm thick layer of 32kg / m3 of cotton board. The 24kg / m3 of glass wool board made a 1m triangular cross section and sharp pops, material areal density increases, the average absorption coefficient close to 1.