Gypsum-containing board and tile, and method for producing same

  • US 7,758,980 B2
  • Filed: 08/12/2008
  • Issued: 07/20/2010
  • Est. Priority Date: 08/21/1997
  • Status: Expired due to Fees
First Claim
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1. A gypsum board comprising set gypsum formed from at least calcined gypsum, water and sodium trimetaphosphate, wherein the amount of the sodium trimetaphosphate compound is from about 0.004 to about 2.0% by weight of the calcined gypsum.

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