Calcium Sulphate Hemihydrate is also known as ________

Calcium sulphate hemihydrate (CaSO4.1/2 H2O) is known as Plaster of Paris.

Plaster of Paris

Plaster of Paris is a white colour powder made up of gypsum.

  • When water is mixed with it, the gypsum crystals are produced, leading to a hard mass.
  • It has an exothermic setting process and may be catalysed by sodium chloride. It can be retarded by alum or borax.
  • Plaster of Paris forms anhydrous calcium sulphate known as dead burnt Plaster of Paris.

There are three types of plaster

  1. Gypsum plaster
  2. Lime plaster
  3. Cement plaster

Uses

  • Plaster of Paris is used as a building material by constructors and architects.
  • It is an excellent moulding and casting agent for various purposes.
  • Orthopaedics uses it to put casts around bone fractures.

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