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  1. And it’s a surprisingly controversial product. Plaster of Paris is made from calcium sulfate, which is naturally toxic. The chemical reaction that creates this substance is called the hydration reaction, and it can produce harmful fumes or other chemical byproducts. Most people aren’t aware that Plaster of Paris is a form of toxic waste.

  2. Mar 14, 2024 · Plaster of paris is prepared by heating calcium sulfate dihydrate, or gypsum, to 120–180 °C (248–356 °F). With an additive to retard the set, it is called wall, or hard wall, plaster, which can provide passive fire protection for interior surfaces.

    • The Editors of Encyclopaedia Britannica
  3. Dec 15, 2007 · Why is the plaster of Paris called so? Plaster is the common name for calcium sulphate hemi hydrate made by heating the mineral gypsum, the common name for sulphate of lime. Plaster was first made ...

  4. Oct 16, 2013 · Plaster of Paris is calcined gypsum (roasted gypsum), ground to a fine powder by milling. When water is added, the more soluble form of calcium sulphate returns to the relatively insoluble form, and heat is produced [2 (CaSO 4 .½ H 2 O) + 3H 2 O → 2 (CaSO 4 .2H 2 O) + Heat].

    • Hemant Sharma, Dhanasekara Prabu
    • 2013
  5. Scientifically known as Calcium Sulfate Hemihydrate, Plaster of Paris is chemically represented as CaSO 4 .1/2H 2 O. This represents the ratio of calcium sulfate to water, suggesting that for each molecule of calcium sulfate, there is half a molecule of water.

  6. Feb 18, 2024 · Plaster of Paris has its origins in the Paris Basin, where large deposits of gypsum were found. The production of plaster of Paris involves a process called calcination, where the gypsum is heated to remove the water content and create calcium sulfate hemihydrate.

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  8. Mar 24, 2023 · The chemical composition of plaster of Paris is calcium sulfate hemihydrate, which means that it contains about half as much water as gypsum. When mixed with water, the hemihydrate crystals dissolve and rehydrate to form the dihydrate crystals, which are then deposited as interlocking crystals.

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