Paint coating for a sound absorbing substrate

摘要

For obtaining a high noise reduction coefficient, especially with acoustical fiberboards, a paint coating (4) is applied to the visual surface of the fiberboard (6). The paint coating (4) substantially consists of a latex emulsion, very small size inert filler particles and water. It is optically opaque and discontinuous. Further, it is smooth and acoustically transparent to sound so that the sound can penetrate through it by having a porosity of not less than about 23 m<3>/min/m<2> (75 ft<3>/min/ft<2>).