Patent ID: 6613424
Filing Date: 2003-09-02
Classification: B28B,B28C,B32B,C04B,E04B,E04C,G10K,Y10T

Abstract:
An acoustically absorbent porous panel comprising:a foamed cementitious layer formed from an uncured aqueous foamed cementitious material comprising on a wet basis about 53% to about 68% by weight cement, about 17% to about 48% by weight water, about 0.05% to about 5% by weight fiber, and about 0.01% to about 10% by weight surfactant selected from a group consisting of amphoteric, anionic, and nonionic surfactants having a hydrophobic portion containing 8 to 20 carbons; pores distributed within the cured material comprising about 75% to about 95% by volume of the layer; wherein the pores have an average size from about 50 &mgr;m to about 200 &mgr;m, and are open to other pores creating pathways through the cementitious material whereby sound can be absorbed; and a backing layer affixed to the foamed cementitious layer.