Fire-resistant gypsum board

C - Chemistry – Metallurgy – 04 – B

Patent

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154/114

C04B 11/28 (2006.01) B32B 13/08 (2006.01) C04B 14/20 (2006.01) C04B 28/14 (2006.01)

Patent

CA 1226801

ABSTRACT OF THE DISCLOSURE A fire-retardant gypsum wallboard having, in the gypsum core, about 2% by weight of a feldspar- free muscovite, in combination with other minor additives including ? inch long glass fibers.

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