Keene's Cement Plaster or Keene's cement is a hard

plaster Plaster is a building material used for the protective or decorative coating of walls and ceilings and for Molding (decorative), moulding and casting decorative elements. In English, "plaster" usually means a material used for the interiors of ...

formulation, primarily used for ornamental work. Alternate names are Martin's cement and Parian cement. It is a calcined formulation of regular calcium sulfate plaster with an

alum An alum () is a type of chemical compound, usually a hydrated double salt, double sulfate salt (chemistry), salt of aluminium with the general chemical formula, formula , where is a valence (chemistry), monovalent cation such as potassium or a ...

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.

References

Plastering {{Material-stub