Alpha-type calcium sulfate hemihydrate compositions
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United States of America Patent
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Apr 13, 2010
Grant Date -
Jun 26, 2008
app pub date -
Dec 27, 2007
filing date -
Mar 20, 2003
priority date (Note) -
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Abstract
O) into a briquette, calcining the briquette to transform the calcium sulfate dihydrate to calcium sulfate hemihydrate [alpha-type], drying the calcium sulfate hemihydrate [alpha-type] briquette, and optionally grinding the briquette. Also disclosed are methods of producing an improved gypsum plaster including producing the disclosed powdered calcium sulfate hemihydrate [alpha-type] and mixing the powdered calcium sulfate hemihydrate [alpha-type] with water.
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