Sound Absorbing Material and Structure Using the Same
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United States of America Patent
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Issued Date -
Jul 10, 2008
app pub date -
Dec 9, 2005
filing date -
Mar 17, 2005
priority date (Note) -
Abandoned
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Abstract
A sound absorbing material (1a) comprising a film (11) composed of a silicone rubber and a porous layer (12) (i.e., a first porous layer) laminated on the back surface of the film (11). The film (11) is made of a material which has flame retardancy and generates no noxious fume during combustion, such as a silicone rubber comprising only polysiloxane. The film (11) used is preferably one which has an oxygen index of 25 or higher, which exhibits a heat release value of combustion per unit volume of 8 MJ/m or less and which exhibits a heat release rate of combustion of [200 kW/m.sup.2]10 sec or less. The first porous layer (12) is formed from a material having flame retardancy, such as glass wool, rock wool or a mixture thereof. A structure (3a) can be formed by providing the sound absorbing material (1a) having the construction described above on a rigid wall (2) in parallel, with the first porous layer (12) facing to the rigid wall (2).
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