A DUAL LAYER ACOUSTICAL CEILING TILE HAVING AN IMPROVED SOUND ABSORPTION VALUE

摘要

An acoustical ceiling tile having an improved sound absorption value and having a dual layer of acoustical materials. The base mat layer has either n o mineral wool or a low mineral wool content. The surface layer has a high mineral wool content which provides improved sound absorption values with or without perforating or fissuring the tile. The dual layer acoustical ceiling tile has a noise reduction coefficient (NCR) value of at least about 0.50.