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An acoustic board is a board made from sound absorbing materials, designed to provide sound insulation. [3] [4] Between two outer walls sound absorbing material is inserted and the wall is porous. Thus, when sound passes through an acoustic board, the intensity of sound is decreased. The loss of sound energy is balanced by producing heat energy.
Acoustic plasters are aesthetically favorable because it allows for seamless smooth application compared to panels that show visible joints. [1] Some acoustic plasters contain aggregate, but better systems incorporate fiber. [2] Acoustic plasters are generally applied at a thickness between 1/16” and 1.5”. [3]
an impervious layer, called back-sheet or back-skin; The lower half of a liner features dedicated internal slots to allow liquid drainage in order to prevent ice formation or fire hazards. From an acoustic perspective, this implies that the upper acoustic panel is a locally reacting liner, whereas the lower one is a non-locally reacting liner. [1]
4-inch (100 mm) hollow CMU (concrete masonry unit) [34] 45 Double layer of 1 ⁄ 2-inch (13 mm) drywall on each side, wood studs, batt insulation in wall 46 Single layer of 1 ⁄ 2-inch (13 mm) drywall, glued to 6-inch (150 mm) lightweight concrete block wall, painted both sides 46 6-inch (150 mm) hollow CMU (concrete masonry unit) [34] 48
Conversely, an NRC of 1.0 indicates that the material provides an acoustic surface area (in units sabin) that is equivalent to its physical, two-dimensional surface area. [1] This rating is common of thicker, porous sound absorptive materials such as 2-inch-thick (51 mm) fabric-wrapped fiberglass panel.
A close-up image of acoustic foam. Acoustic foam is an open celled foam used for acoustic treatment. It attenuates airborne sound waves, reducing their amplitude, for the purposes of noise reduction or noise control. [1] The energy is dissipated as heat. [2] Acoustic foam can be made in several different colors, sizes and thickness. [3]
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