Berman, Aisenberg & Platt
Foamed gypsum moulded articles and production thereof
 Present invention provides foamed gypsum moulded articles excellent in sound absorbing property and production thereof. The foamed gypsum moulded article has many foam-cells, and the foam-cells are interconnected through fine passages. The fine passages are formed using as a decomposition catalyst of hydrogen peroxide for expansion a cobalt compound produced by pretreating a water soluble cobalt salt with hydrogen peroxide in the presence of alkali. The foamed gypsum moulded article is preferably applicable to an interial wall, ceiling panel, and the like. 
Kurashiki Boseki Kabushiki Kaisha
Y C Y
Y10T C04B Y10T
additional inventional additional
Toru Masumi Eiichi Masao
Nishino Saito Hirai Endo