| abstract |
An object of the present invention is to reduce mounting man-hours while maintaining soundproof performance. SOLUTION: An open cell structure having an open cell ratio of 50% or more, a hardness of 5 N / cm 2 or more, a density of 0.03 to 0.15 g / cm 3 , a cell diameter of 0.5 to 10 mm, and an average sound of 1 to 2 KHz It has the base material layer 1 which consists of a rigid foaming urethane provided with each characteristic that a sound absorption coefficient is 45% or more. Since the base material layer 1 has the above characteristics, it has sufficient shape retention and excellent sound absorption characteristics. [Selection] Figure 1 |