In recent years, the insulation requirements of new building maintenance structures are getting higher and higher, and new building insulation materials have also been developed to a greater extent. So do you know the thermal insulation and sound absorption performance of rock wool board?
Rock wool board has good sound absorption performance for medium and high frequency sound. The main factors affecting the sound absorption performance of rock wool board are thickness, density and air flow resistance. Density is the weight per cubic meter of material. The air flow resistance is the ratio of the air pressure on both sides of the material per unit thickness to the air flow velocity. Air flow resistance is an important factor affecting the sound absorption performance of rock wool board. 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; If the flow resistance is too large, it means that the material is dense, air vibration is difficult to enter, and the sound absorption performance is also reduced. For rock wool board, sound absorption performance has good flow resistance. In practical engineering, air flow resistance is difficult to measure, but it can be roughly estimated and controlled by thickness and unit weight. Below, rock wool board manufacturers share with you the thermal insulation and sound absorption performance of rock wool board.
With the increase of thickness, the sound absorption coefficient of medium and low frequency increases obviously, but the high frequency changes little. With the same thickness, the unit weight increases, and the medium and low frequency sound absorption coefficient also increases; However, when the bulk density increases to a certain extent, the material becomes dense, the flow resistance is greater than the optimal flow resistance, and the sound absorption coefficient decreases.
For centrifugal glass wool with a unit weight of 16kg/m3 and a thickness of more than 5cm, the low frequency 125Hz is about 0.2, and the medium and high frequency sound absorption coefficient is close to 1. When the thickness continues to increase, the low-frequency sound absorption coefficient gradually increases from 5cm. When the thickness is greater than 1m, the sound absorption coefficient of low frequency 125Hz will be close to 1. When the thickness remains the same and the unit weight increases, the low-frequency sound absorption coefficient plate of the thermal insulation rock wool will continue to increase.
When the unit weight is close to 110kg/m3, the sound absorption performance reaches a large value, which is close to 0.60.7 at 50mm thickness and 125Hz frequency. When the unit weight exceeds 120kg/m3, the sound absorption performance decreases, because the material becomes dense, and the medium and high frequency sound absorption performance is greatly affected. When the unit weight exceeds 300kg/m3, the sound absorption performance decreases a lot. The commonly used sound-absorbing rock wool board for building acoustics has a thickness of 3cm, 5cm and 10cm, and a unit weight of 80, 100, 120, 140 and 160kg/m3. Usually 5cm thick Jinan rock wool board is used.
The above is what Xiaobian shared with you about the analysis of the thermal insulation and sound absorption performance of rock wool board. If you need sheet products, you can follow our website www.jnhxtcg Com.