| 摘要 |
PROBLEM TO BE SOLVED: To provide a refractory panel which is thin in thickness, light in weight, low in cost, and has soundproof performance. SOLUTION: The refractory panel consists of a substrate, a damping sheet, and a constraining member. The substrate is formed of a flame-retardant material having a density of 1 g/cm<SP>3</SP>or less. The damping sheet is formed of a polymeric organic material having a loss tangent (tanδ) peak value of 1.5 or more, and has one surface thereof laminated at least on one surface of the substrate. The constraining member has a modulus of longitudinal elasticity, equal to 1GPa or more, and is laminated on the other surface of the damping sheet. COPYRIGHT: (C)2004,JPO
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