Fire-resistant gypsum building materials
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United States of America Patent
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-
Aug 31, 1999
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Oct 12, 1989
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Fiberboards are provided containing at least about 65 wt. % calcium sulfate dihydrate derived from hemihydrate or anhydrous gypsum, and at least about 7 wt. % pulped paper fibers. The boards are capable of being formed into structural members having superior mechanical properties and/or fire resistance, including screw-holding capacities in excess of 650 lbs.
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