Plaster

This article is about the building material. For the adhesive medical dressing, see Sticking plaster.

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Plaster of Paris, or simply plaster, is a type of building material based on calcium sulfate hemihydrate, nominally (CaSO4)2. H2O. It is created by heating gypsum to about 150?C, 2(CaSO4 · 2H2O) → (CaSO4)2 · H2O + 3 H2O (released as steam). A large gypsum deposit at Montmartre in Paris is the source of the namehttp://www.bartleby.com/61/63/P0356300.html. When the dry plaster powder is mixed with water, it re-forms into gypsum, initially as a paste but eventually drying into a solid. The structure is made up of sheets of Ca2+ and SO42- ions held together by hydrogen bonds in the water molecules. The grip between these sheets is easily broken, so plaster is fairly soft.

Gypsum: Gypsum is a very soft mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O....

Montmartre: Montmartre is a hill in the north of Paris, France, in the 18th arrondissement, a part of the Right Bank. The community on the hill is also called Montmartre....

Paris: Paris is the capital city of France, as well as the capital of the ?le-de-France r?gion, whose territory encompasses Paris and its suburbs. The city of Paris proper is also a d?partement, called Paris d?partement (French: d?partement de Paris). It is a wonderful city for aimless wandering of which f...

Plaster related Images and Photos (experimental)

Basilisk Capital from Cathedral of Notre Dame at Reims (Plaster Cast from Stone)