Glass wool products for sandwich walls are divided into two types: glass wool felt and glass wool board. The surface of the felt or board can be coated with black glue or adhered with a layer of black (source: China Insulation Network) glass fiber felt for reinforcement. It is suitable for commercial use. , Thermal insulation of double walls in industrial and public buildings.

Glass wool products for sandwich walls can provide you with the following benefits: Prevent condensation, reduce wall weight, increase use area, save energy, increase comfort, sound insulation, and fire prevention.

Centrifugal glass wool has good sound absorption performance for mid-to-high-frequency sound. The main factors affecting the sound absorption performance of centrifugal glass wool 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 and the air vibration is easy to pass through, and the sound absorption performance is reduced; if 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. In actual engineering, it is difficult to measure air flow resistance, but it can be roughly estimated and controlled by thickness and bulk density.

1. With the increase of thickness, the sound absorption coefficient of medium and low frequency increases significantly, but the high frequency changes little (high frequency absorption is always larger).
2. When the thickness is unchanged, the bulk density increases, and the sound absorption coefficient of mid-low frequency also increases; but when the bulk density increases to a certain level, the material becomes dense, the flow resistance is greater than the optimal flow resistance, and the sound absorption coefficient decreases instead. For centrifugal glass wool with a bulk density of 16Kg/m3 and a thickness of more than 5cm, the low frequency 125Hz is about 0.2, and the medium and high frequency (>500Hz) sound absorption coefficient is close to 1.
3. When the thickness continues to increase from 5cm, the low-frequency sound absorption coefficient gradually increases. When the thickness is greater than 1m, the low-frequency 125Hz sound absorption coefficient will also be close to 1. When the thickness is constant and the bulk density increases, the low-frequency sound absorption coefficient of centrifugal glass wool will continue to increase. When the bulk density is close to 110kg/m3, the sound absorption performance reaches its maximum value, which is close to 0.6-0.7 at a thickness of 50mm and a frequency of 125Hz. When the bulk density exceeds 120kg/m3, the sound absorption performance decreases because the material becomes dense, and the mid- and high-frequency sound absorption performance is greatly affected. When the bulk density exceeds 300kg/m3, the sound absorption performance decreases a lot.

The thickness of sound-absorbing glass wool commonly used in architectural acoustics is 2.5cm, 5cm, 10cm, and its bulk density is 16, 24, 32, 48, 80, 96, 112kg/m3. Usually use 5cm thick, 12-48kg/m3 centrifugal glass wool.