Gips plaster
Plaster of Paris, or simply plaster, is a type of building material based on calcium sulfate hemihydrate, nominally CaSO4* It is created by heating gypsum to about 150 oC. CaSO4 · 2H2O - CaSO4 · + (released as steam). A large gypsum deposit at Montmartre in Paris is the source of the name[1]. When the dry plaster powder is mixed with water, it re-forms into gypsum, initially as a paste but eventually hardening into a solid. The structure consists 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. Plaster is used as a building material similar to mortar or cement. Like those materials plaster starts as a dry powder that is mixed with water to form a paste, which then hardens. Unlike those materials plaster remains quite soft after drying, and can be easily manipulated with metal tools or even sandpaper. These characteristics make plaster suitable for a finishing, rather than a load-bearing material.
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