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The sound reduction index is used to measure the level of sound insulation provided by a structure such as a wall, window, door, or ventilator. It is defined in the series of international standards ISO 16283 (parts 1-3) and the older ISO 140 (parts 1-14), or the regional or national variants on these standards.
Solid-core – Can consist of low-density particle board or foam used to completely fill the space within the door. Solid-core flush doors (especially foam-core ones) are commonly used as exterior doors because they provide more insulation and strength. Skin – The front and back faces of the door are covered with HDF/MDF skins.
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Interior walls with 1 sheet of 1 ⁄ 2-inch (13 mm) gypsum wallboard on either side of 2x4 (1 + 1 ⁄ 2 in × 3 + 1 ⁄ 2 in or 38 mm × 89 mm) wood studs spaced 16 inches (410 mm) on-center with no fiberglass insulation filling each stud cavity have an STC of about 33. [14]
The pressing cycle operates in stages, with the mat thickness being first compressed to around 1.5 times the finished board thickness, then compressed further in stages and held for a short period. This gives a board profile with zones of increased density, thus mechanical strength, near the two faces of the board and a less dense core. [9]
The most widely used definition was developed in 1964 by D. U. Deere. It is the borehole core recovery percentage incorporating only pieces of solid core that are longer than 100 mm in length measured along the centerline of the core. In this respect pieces of core that are not hard and sound should not be counted though they are 100 mm in length.
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