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The Sound Absorption Characteristics of Glass Wool
Posted by:Yolanda Date:29.Aug.2020
Why does glass wool absorb sound?
The fiber inside the glass wool is fluffy and interlaced, and there are a lot of tiny pores. It is a typical porous sound-absorbing material with good sound-absorbing performance. The reason why glass wool can absorb sound is not because of its rough surface, but because it has a large number of tiny pores and pores that connect inside and outside. When sound waves are incident on glass wool, the sound waves can enter the material along the pores, causing vibration of air molecules in the pores. Due to the viscous resistance of air and the friction between air molecules and the pore wall, sound energy is converted into heat energy and is lost. Glass wool can be made into wall panels, ceilings, space sound absorbers, etc., which can absorb a large amount of sound energy in the room, reduce reverberation time, and reduce indoor noise.
The sound absorption characteristics of glass wool are not only related to the thickness and bulk density, but also related to factors such as the cover material and structure. In construction applications, it is also necessary to take into account many aspects such as cost, beauty, fire prevention, moisture resistance, dust, and aging resistance.
The main factors affecting the sound absorption performance of glass wool panels are thickness, density and air flow resistance. Density is the weight of material per cubic meter. Air flow resistance is the ratio of air pressure and air velocity on both sides of the material per unit thickness. Air flow resistance is the most important factor affecting the sound absorption performance of centrifugal glass wool. If the flow resistance is too small, it means that the material is sparse, the air vibration is easy to pass through, and the sound absorption performance is reduced; the flow resistance is too large, it means that the material is dense, the air vibration is difficult to transmit, and the sound absorption performance is also reduced. For centrifugal glass wool, the sound absorption performance has the best flow resistance.
Noise pollution has become one of the three major pollution in the city. We all desire a quiet living and working environment. Therefore, in many companies and even residential places, sound insulation has become a common demand for everyone. In the installation of sound insulation devices, Glass wool sound-absorbing board is the most used sound insulation material.
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