Fire-resistant members containing gypsum fiberboard
AssigneeGeorgia-Pacific Corporation
InventorGeorge F. Fowler
Life of this patent
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Abstract
Fire-resistant structures are provided having at least a 20 minute ASTM E-152 fire test rating. The structures include glass partition walls having framing members formed from a gypsum-containing composition having a density of at least about 60 lbs/ft.sup.3, a flexural strength of at least 30 lbs ( 1/2 inch thick material), and a screw-holding capacity of at least about 400 lbs. The gypsum-containing composition further contains a substantially uniform distribution of solids including about 65 wt.% to about 90 wt.% set gypsum dihydrate, about 7 wt.% to about 30 wt.% paper fiber, and about 1.5 wt.% to about 35 wt.% of one or more performance boosters selected from inorganic fiber, clay, vermiculite, and binder polymer.
Claims29
A method of preparing an improved structure of the type having a glass panel supported by at least first and second framing members and having at least a 20 minute ASTM E-152 fire test rating, characterized by the steps comprising:
- attaching said first framing member to said second framing member to provide support for said glass panel, at least one of said framing members comprising a gypsum-containing fiberboard composition having a density of at least about 60 lbs/ft.sup.3, a flexural strength of at least about 30 lbs (1/2 inch thick material), and a screw-holding capacity of at least about 400 lbs, said composition containing a substantially uniform distribution of solids including about 65 wt.% to about 97 wt.% set gypsum dihydrate and about 1.5 wt.% to about 30 wt.% paper fiber.
An improved structure comprising:
- (a) a glass panel;
- and
- (b) framing members for framing and supporting said glass panel, at least one of said framing member comprising a gypsum-based framing member having a density of at least about 60 lbs/ft.sup.3.
Dependencies are inferred from the claim text.