Flame-resistant plaster board and its manufacture
AssigneeSumitomo Chemical Company, Limited
InventorsKozo Fukuba, Minematsu Miyazaki
Life of this patent
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Abstract
A flame-resistant plaster board characterized in that the board paper constituting the outside of the plaster board contains at least one alkali compound selected from the group consisting of hydroxides and salts of alkali metals and alkaline earth metals which easily decompose or melt on heating. Said flame-resistant plaster board is improved in that the generation of smoke on heating is inhibited without reduction of the mechanical strength.
Claims8
A flame-resistant plaster board, characterized in that the board paper constituting the outside of said plaster board contains a mixture of sodium formate and calcium formate, and a penetrating agent.
A method for making a plaster board smoke-inhibited on heating, which comprises treating the plaster board molded with an aqueous solution or slurry of a mixture of sodium formate and calcium formate to impregnate the solution or slurry into the board paper constituting the outside of the plaster board, or by molding a plaster board usig as a constituent of the outside a board paper previously treated with an aqueous solution or slurry of the said mixture.
Dependencies are inferred from the claim text.