What Is Glass Wool?

Glass wool belongs to a category of glass fiber and is an artificial inorganic fiber. Glass wool is a material that melts molten glass to form a cotton-like material. Its chemical composition belongs to glass and is an inorganic fiber. It has good molding, small bulk density, low thermal conductivity, thermal insulation, sound absorption, and corrosion resistance. Chemical stability.

Glass wool

Glass wool is used for centrifugal glass wool felt

The sound absorption characteristics of centrifugal glass wool are not only related to the thickness and

Centrifugal glass wool is a porous sound-absorbing material with good sound-absorbing performance. The reason why centrifugal glass wool can absorb sound is not because of the rough surface, but because it has a lot of tiny pores and pores that communicate with each other. When sound waves are incident on centrifugal glass wool, the sound waves can enter the interior of the material along the pores, causing vibrations of air molecules in the pores. Due to the air's viscous resistance and the friction between air molecules and the pore wall, acoustic energy is converted into thermal energy and lost.

In the construction use of centrifugal glass wool, the surface often has a certain sound-transmitting finish, such as plastic films less than 0.5mm, metal mesh, window screening, fireproof cloth, glass cloth, etc., which can basically maintain the original sound absorption characteristics. Centrifugal glass wool has excellent properties such as fire resistance, heat insulation, and easy cutting. It is one of the most commonly used materials for building sound absorption. However, because the surface of the centrifugal glass wool is not decorative, and there will be fibers spilled, it must be made into various sound-absorbing members for concealment. The most commonly used and least expensive structure is the ceiling of a perforated paper plasterboard or a perforated board wall made of centrifugal glass wool. When the perforation rate is greater than 20%, the sound absorption performance of centrifugal glass wool can be fully used. . In order to prevent glass wool fibers from spilling, a layer of non-woven fabric, mulberry paper, or other sound-transmitting fabric needs to be attached to the back of the perforated plate, or glass wool or plastic film must be used to cover the glass wool. Similar to the perforated paper board, there are perforated metal plates (such as aluminum plates), perforated wood boards, perforated fiber cement boards, perforated mineral wool boards, etc.

The glass wool board can be processed into a sound-absorbing ceiling board or a sound-absorbing wall board after processing. Generally, the surroundings of 80-120kg / m3 glass wool board are glued and cured with a fireproof sound-transmitting fabric to form a sound-absorbing wall panel that is both beautiful and easy to install. Common dimensions are 1.2m × 1.2m, 1.2m × 0.6m, 0.6m × 0.6m, thickness 2.5cm or 5cm. There is also a sound-absorbing ceiling board formed by spraying sound-transmitting decorative materials directly on the surface of 110Kg / m3 glass wool. Whether it is a glass wool sound-absorbing wall board or a sound-absorbing ceiling board, glass wool with a high bulk density needs to be used and undergoes certain strengthening treatment to prevent the board from deforming or becoming too soft. This type of building materials not only has good decorative properties but also retains the good sound absorption characteristics of centrifugal glass wool. The noise reduction coefficient NRC can generally reach above 0.85.

In large spaces such as stadiums and workshops, in order to absorb sound and reduce noise, a sound-absorbing body with centrifugal glass wool as the main sound-absorbing material is often used. The sound absorbing body can be made into a plate shape, a column shape, a cone shape, or other special shapes according to requirements. The inside of the sound-absorbing body is filled with centrifugal glass wool, and the surface is wrapped with a sound-transmitting surface layer. Because the sound absorbing body has multiple surface sound absorption, the sound absorption efficiency is very high.

In road sound insulation barriers, in order to prevent noise reflection, it is necessary to take sound absorption measures on the side facing the vehicle. Often, centrifugal glass wool is also used as the filling material and the barrier layer is a perforated metal plate. In order to prevent glass wool from absorbing water and moisture outdoors, it is sometimes wrapped with PVC or plastic film.