Plaster of Paris

CAS Registry Number®

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CAS Name

Plaster of Paris

Molecular Formula


Cite this Page

Plaster of Paris.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d. (retrieved 2022-06-30) (CAS RN: 26499-65-0).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Compound Properties

  • Melting Point (1)

    163 °C
  • Density (2)

    1.55 g/cm3


Other Names and Identifiers

Other Names for this Substance

  • Plaster of Paris (Ca(SO4).1/2H2O)
  • Plaster of Paris
  • Gypsum hemihydrate
  • Hemihydrate gypsum
  • TA 20

Deleted or Replaced CAS Registry Numbers