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P423
- Plaster of Paris Soundex Code P423 http://en.wikipedia.org/wiki/Plaster#Gypsum_plaster_.28plaster_of_Paris.29 Gypsum plaster, or plaster of Paris, is produced by heating gypsum to about 300 °F (150 °C): CaSO4·2H2O + heat → CaSO4·0.5H2O + 1.5H2O (released as steam).
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Gypsum plaster (plaster of Paris) Gypsum plaster, also known as plaster of Paris, is a white powder consisting of calcium sulfate hemihydrate. The natural form of the compound is the mineral bassanite. Etymology. The name "plaster of Paris" was given because it was originally made by heating gypsum from a large deposit at Montmartre, a hill in ...
- Things You Should Know. Make plaster of Paris using 2 parts plaster of Paris powder and 1 part water, stirring until the mixture is smooth and thoroughly blended.
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- Things You’ll Need. Measuring cup. Disposable mixing bowl. Spatula or Disposable spoon. Water. Plaster of Paris powder. Petroleum jelly. White school glue (optional)
Mar 14, 2024 · plaster of paris, quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry. Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris.
- The Editors of Encyclopaedia Britannica
The word gypsum is derived from the Greek word γύψος (gypsos), "plaster". Because the quarries of the Montmartre district of Paris have long furnished burnt gypsum ( calcined gypsum) used for various purposes, this dehydrated gypsum became known as plaster of Paris .
- Massive, flat. Elongated and generally prismatic crystals
- Prismatic (2/m), H-M symbol: (2/m)
- 1.5–2 (defining mineral for 2)
- Monoclinic
Plaster of Paris is traditionally used as a casting material once the impression has been taken, however its use as an impression material is occasionally useful in edentate patients. The tissues are not displaced during impression taking, hence the material is termed mucostatic.
Feb 18, 2024 · Key Takeaways: Plaster of Paris is a gypsum-based casting material used for sculpting and creating orthopedic casts. Its ability to harden quickly when mixed with water makes it ideal for various art and craft projects. Plaster of Paris has a long history of use in construction, art, and medicine.
Chemical Composition. 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.
