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Sound Absorption  Glass Wool

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insulation

Centrifugal glass wool insulation has good sound absorption performance for high frequency sound.The main factors affecting the sound absorption performance of centrifugal glass wool are thickness, density and airway resistance etc.Density is the weight per cubic meter of material.Airway resistance is the ratio of the static pressure difference between the two sides of a material and the air velocity per unit thickness.Airway resistance is the most important factor affecting the sound absorption performance of centrifugal glass wool insulation.The airway resistance is too small, indicating that the material is sparse, the air vibration is easy to pass through, and the sound absorption performance decreases.The airway resistance is too large, indicating that the material is too compact, air vibration is difficult to pass through, sound absorption performance also declined.For centrifugal glass wool insulation, the sound absorption performance has the best airway resistance.

 

Glass Wool

In practical engineering, it is difficult to measure airway 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 sound increases significantly, but that of high frequency sound changes little (the high frequency absorption is always large).

 

insulation board

2. The thickness remains unchanged, the bulk density increases, and the sound absorption coefficient of medium and low frequency sound also increases;However, when the bulk density increases to a certain extent, the material becomes dense, the airway resistance is greater than the optimal ones, and the sound absorption coefficient decreases instead.For centrifugal glass wool insulation board with a bulk density of 16Kg/m3 and a thickness of over 5cm, the sound absorption coefficient of 125Hz at low frequency is about 0.2, and that of medium high frequency (>500Hz) is close to 1.When the thickness continues to increase from 5cm, the sound absorption coefficient of the low frequency sound will gradually increase. When the thickness is more than 1m, the sound absorption coefficient of the low frequency 125Hz will also be close to 1.When the thickness remains unchanged and the bulk density increases, the low-frequency sound absorption coefficient of the centrifugal glass wool insulation board will also continuously increase. When the bulk density approaches 110kg/m3,at 50mm thick , the sound absorption performance reaches the maximum value and is close to 0.6-0.7 at 125Hz frequency.When the bulk density exceeds 120kg/m3, the sound absorption performance decreases instead, because the material becomes dense and the sound absorption performance of medium and high frequency is greatly influenced. When the bulk density exceeds 300kg/m3, the sound absorption performance decreases a lot.The thickness of sound absorbing glass wool insulation board commonly used in architectural acoustics is 2.5cm, 5cm and 10cm, and its bulk density is 16, 24, 32, 48, 80, 96 and 112kg/m3. 5cm thick, 12-48kg/m3, centrifugal glass wool is usually used.

batt insulation

The sound absorption performance of centrifugal glass wool batt insulation is also closely related to the installation conditions.When there is an air layer behind the glass wool batt insulation, the sound absorption effect is higher than that of the glass wool batt insulation without air layer of the same thickness.In particular, the sound absorption performance of medium and low frequency will be greatly improved compared with that of the material actually attached to the hard bottom, and the sound absorption coefficient will increase with the increase of the thickness of the air layer, but the effect will not be obvious after increasing to a certain value.

wall insulation

Fanfei (Beijing) Energy Saving Technology Co., ltd.is a professional manufacturer and exporter of glass wool wall insulation .Our products are exported to many countries in the world. We are a factory, with our own equipment, workers, R & D team and sales department.Our company produces building materials like of waterproof membrane, batt insulation, breathable membrane and radiant barrier foil as well as insulation facing and flashing tapes.We are engaged in construction material production industry since 1990 and established the company in 1995. Over 2000 companies and customers home and abroad have bought our products. Most of our products could provide OEM service according to customers’ requirement.

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