Keene's cement plaster or Keene's cement is a hard plaster formulation, primarily used for ornamental work. Alternative names are Martin's cement and Parian cement. It is a calcined formulation of regular calcium sulfate plaster with an alum admixture. The compound gives a hard finish that can be polished. The product was developed by Richard Wynn Keene and patented in 1838.The Repertory of Patent Inventions, new series, vol. 10, June–December 1838, pp. 229–232.
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