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What are the different uses of plaster of Paris?
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What is difference in plaster of Paris and gypsum?
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Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris. Plaster of paris does not generally shrink or crack when dry, making it an excellent medium for casting molds. It is commonly used to precast and hold parts of ornamental plasterwork placed on ceilings and cornices. It is also used in medicine to make plaster casts to immobilize broken bones while they heal, though many modern
Dec 15, 2007 · Plaster was first made about 9000 years ago, and has been used by ancient Egyptian, Greek and Roman civilizations. However, it wasn’t used on a large scale until 1700s, when it was required to be used in all construction in Paris. In 1666, a fire raged across London, destroying many parts of it.
The production of plaster casts or other plaster wares begins with a dry, fine white powder, produced by heating the mineral compound gypsum. Gypsum plaster, as distinct from lime plaster (more commonly used in fresco and whitewash, for example), is also named Plaster of Paris for the large deposits of the material in Paris near Montmartre.
A large gypsum deposit at Montmartre in Paris led "calcined gypsum" (roasted gypsum or gypsum plaster) to be commonly known as "plaster of Paris". Plasterers often use gypsum to simulate the appearance of surfaces of wood, stone, or metal, on movie and theatrical sets for example.
Plastering is one of the most ancient of the building handicrafts. Plaster is the common name for calcium sulphate hemi hydrate made by heating the mineral gypsum, the common name for sulphate of lime. In the tenth century the Arabs used liquid plaster in orthopaedic treatment. At the beginning of the nineteenth century, patients with fractures of the lower extremities-and often of the upper extremities as well-were treated in bed with restriction of all activity for many weeks until the ...
- Philippe Hernigou