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Fire-resistant members containing gypsum fiberboard

  • US 5,601,888 A
  • Filed: 02/14/1995
  • Issued: 02/11/1997
  • Est. Priority Date: 02/14/1995
  • Status: Expired due to Term
First Claim
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1. 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/ft3, 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.

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