What is glass wool?
is an insulation material that has emerged in recent years. Glass wool insulation
belongs to the category of glass fiber
, which is a man-made inorganic fiber. Because it is like cotton of light quality, so it is called glass wool. Glass wool is molten glass fibrillation, the formation of cotton-like materials, chemical composition of the glass class, is a kind of inorganic fiber
. It has good molding, small bulk density, thermal conductivity, heat insulation, good sound absorption, corrosion resistance, and chemical stability.Glass wool
is made of centrifugal glass wool felt is molten glass fibrillated and processed with thermosetting resin-based environmentally friendly formula binder, is a kind of glass fiber made of only a few microns in diameter with an elastic felt body, and can be used according to the requirements of different moisture-proof veneer online composite materials. It has a large number of tiny air pores so it plays thermal insulation, sound absorption, noise reduction, safety protection, etc., and is the best material for heat insulation, sound absorption, and noise reduction in steel buildings.Glass wool
uses quartz sand, limestone, dolomite, and other natural ores as the main raw material, with some soda ash, borax, and other chemical materials fused into glass. In the molten state, with the help of external force blowing type thrown into flocculent fine fibers, fibers and fibers for three-dimensional cross, entwined with each other, showing many small gaps. This gap can be regarded as a pore. Therefore, glass wool is a porous material with good heat insulation and sound absorption properties.
Function of glass wool
Glass wool can play the role of insulation, and is one of the many insulation materials. Glass wool insulation principle for glass wool fibers are three-dimensional cross-wound, and slender fibers to separate the air into a small air package, the flow of air resistance. This leads to the air almost cannot flow, and it is difficult to convective heat transfer, because of the strong insulation properties of still air, so the glass wool shows excellent insulation properties. Insulation glass wool is generally used as building insulation, air conditioning ducts external insulation, and internal insulation, as well as steel structures, industrial high temperature, and HVAC system insulation.
Glass wool can play the role of sound absorption, and is one of the many acoustic materials. The principle of sound absorption of glass wool is that glass wool is open structure material, which means that the external noise through the internal glass wool, through the internal holes (gaps) in the fiber vibration, as well as through the inner part of the separation of one air packet to produce air resistance, weakening the vibration of air, sound energy from mechanical energy into heat energy is absorbed, and therefore has excellent sound absorption properties. Acoustic glass wool can generally be used in KTV, opera houses, concert halls, cinemas, or office buildings for sound absorption and noise reduction.
Glass wool has both thermal insulation and sound-absorbing noise reduction role, so glass wool can be used as both thermal insulation materials, but also as acoustic materials, which is one of the advantages of glass wool compared to other insulation materials.
Feature of glass wool
Glass wool insulation
Centrifugal glass wool internal fiber is fluffy interlaced, so there are a large number of tiny pores. It is a typical porous sound-absorbing material, so it has good sound-absorption characteristics. Centrifugal glass wool can be made into wall panels, ceilings, space acoustic bodies, etc., which can absorb a large amount of sound energy in the room, reduce the reverberation time and reduce indoor noise.
The sound absorption characteristics of centrifugal glass wool are not only related to the thickness and weight, but also related to the cover material, structure, and other factors, and also need to take into account the cost, beauty, fire, moisture, dust, aging resistance, and other aspects.
Centrifugal glass wool is a porous sound-absorbing material with good sound-absorption properties. Centrifugal glass wool can absorb sound not because of the rough surface, but because there are a large number of tiny pores and holes connected inside and outside. When sound waves are incident on the centrifugal glass wool, the sound waves can follow the pores into the interior of the material, causing the vibration of air molecules in the gaps. Due to the viscous resistance of air and air molecules and the friction of the pore wall, the sound energy is converted into heat energy and loss.
a. Anti-bacteria and anti-mildew, anti-aging and anti-corrosion to ensure a healthy environment.
b. Feel free to cut and shape at will.
Stable physical properties
The scope of application is used in industrial plants, warehouses, public facilities, exhibition centers, shopping malls, and all kinds of indoor playgrounds, sports venues, and other buildings for thermal insulation, sound absorption, and noise reduction.
Sound absorption performance
Centrifugal glass wool has good sound absorption performance for sound in high frequency. Thickness, density, and airflow resistance are the main factors affecting the sound absorption performance of centrifugal glass wool. Density is the weight of the material per cubic meter. Air flow resistance is the ratio of air pressure and airflow rate on both sides of the material at unit thickness. Air flow resistance is the most important factor affecting the sound absorption performance of centrifugal glass wool. Flow resistance is too small, indicating that the material is sparse, air vibration is easy to pass through, and the sound absorption performance decreases; flow resistance is too large, indicating that the material is dense, air vibration is difficult to pass into, and the sound absorption performance also decreases. For centrifugal glass wool, the best flow resistance exists for sound absorption performance.
In practical engineering, it is difficult to determine the airflow resistance, but it can be roughly estimated and controlled by the thickness and capacity of glass wool.
a. As the thickness increases, the low and middle-frequency absorption coefficient of glass wool increases significantly, but the high frequency does not change much (high-frequency absorption is always greater).
b. The thickness of glass wool remains unchanged, the capacitance increases, and the absorption coefficient of low and medium frequencies also increases; but when the capacitance increases to a certain extent, the material becomes dense, the flow resistance is greater than the best flow resistance, the absorption coefficient decreases instead. For a thickness of more than 5cm of 16Kg/m3 of centrifugal glass wool, low-frequency 125Hz is about 0.2, high frequency (>500Hz) absorption coefficient is close to 1. When the thickness continues to increase from 5cm, the absorption coefficient of low frequency gradually increases, when the thickness is greater than 1m or more, the absorption coefficient of low-frequency 125Hz will also be close to 1. When the thickness remains unchanged and the capacity increases, the low-frequency absorption coefficient of centrifugal glass wool will also continue to improve, when the capacity is close to 110kg/m3 sound absorption performance reaches its maximum, 50mm thick, frequency 125Hz at close to 0.6- 0.7. When the capacity 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, and when the capacity exceeds 300kg/m3, the sound absorption performance decreases a lot. The thickness of acoustic glass wool commonly used in building acoustics is 2.5cm, 5cm, and 10cm, with a capacity of 16, 24, 32, 48, 80, 96, and 112kg/m3. 5cm thick, 12-48kg/m3 centrifugal glass wool is usually used.
c. The sound absorption performance of centrifugal glass wool also has a close relationship with the installation conditions. When there is an air layer behind the glass wool board, the sound absorption effect is similar to that of a glass wool board without an air layer of the same thickness. Especially the low and medium frequency sound absorption performance than the material solid paste on the hard bottom surface will have a greater increase in sound absorption coefficient will increase with the thickness of the air layer, but the effect is not obvious after increasing to a certain value.
With the use of different-weight glass wool stacked together to form a gradually increasing form of capacity, you can get a greater sound absorption effect. For example, a layer of 2.5cm thick 24kg/m3 of cotton board, and a layer of 2.5cm thick 32kg/m3 of cotton board stacked together and the sound absorption effect is better than a layer of 5cm thick 32kg/m3 of the cotton board. The 24kg/m3 glass wool board is made into a 1m-long section of triangular-shaped sharp cleavage, the surface density of the material gradually increases, and the average absorption coefficient can be close to 1. Glass wool is a unique centrifugal technology, fused glass fibrillation, and thermosetting resin-based environmentally friendly formula binder processing product is a kind of elastic glass fiber product made of only a few microns in diameter glass fiber It is an elastic fiberglass product made of glass fibers with a diameter of only a few microns and can be laminated online with a moisture-proof veneer according to the different requirements of customers. Because it has a large number of tiny air gaps, it plays a role in heat insulation, sound absorption, and noise reduction, and safety protection is the best material for building heat insulation, sound absorption, and noise reduction. Unique advantages, unique technology, 99.2% resilience after compression packing. The soft and slender glass fiber minimizes flocculation during construction.
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