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  2. Plaster - Wikipedia

    Gypsum plaster/powder, or plaster of Paris, or P.O.P. consists of white powder of calcium sulphate hemihydrate. The chemical formula is given as CaSO 4 ⋅ 1 2 H 2 O {\displaystyle {\ce {CaSO4. 1/2H2O}}} .

    • Types

      Clay plaster is a mixture of clay, sand and water with the...

    • Applications

      Early 19th Century plasterer at work - painting by John...

    • Safety issues

      The chemical reaction that occurs when plaster is mixed with...

  3. Calcium sulfate - Wikipedia

    Calcium sulfate is the inorganic compound with the formula CaSO4 and related hydrates. In the form of γ-anhydrite, it is used as a desiccant. One particular hydrate is better known as plaster of Paris, and another occurs naturally as the mineral gypsum. It has many uses in industry. All forms are white solids that are poorly soluble in water. Calcium sulfate causes permanent hardness in water.

    • CaSO₄
    • 136.14 g/mol (anhydrous), 145.15 g/mol (hemihydrate), 172.172 g/mol (dihydrate)
    • 1,460 °C (2,660 °F; 1,730 K) (anhydrous)
    • 0.21g/100ml at 20 °C (anhydrous), 0.24 g/100ml at 20 °C (dihydrate)
  4. plaster of Paris - Wiktionary

    Feb 27, 2020 · plaster of Paris (uncountable) A hemihydrate of calcium sulfate, made by calcining gypsum, that hardens when moistened and allowed to dry; used to make casts, molds and sculpture.

  5. Head Carrier - Wikipedia

    Head Carrier is the sixth studio album by the American alternative rock band the Pixies, released on September 30, 2016 on Pixiesmusic and PIAS.Produced by Tom Dalgety, and recorded at RAK Studios in London, the album is the first to feature bass guitarist Paz Lenchantin, who joined the band in 2014 to tour in support of its previous album, Indie Cindy.

    • September 30, 2016
    • RAK Studios, London
  6. Orthopedic cast - Wikipedia

    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 sulfate returns to the relatively insoluble form, and heat is produced. 2 (CaSO 4 ·½ H 2 O) + 3 H 2 O → 2 (CaSO 4 .2H 2 O) + Heat.

    • Body casts, plaster cast, surgical cast
  7. plaster of paris | Definition, Uses, & History | Britannica

    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.

  8. Plasterer - Wikipedia

    For their finest work the Egyptians used a plaster made from calcined gypsum just like plaster of Paris of the present time, and their methods of plastering on reeds resemble in every way our lath, plaster, float and set work. Hair was introduced to strengthen the stuff, and the whole finished somewhat under an inch thick.

  9. Plaster of Paris | definition of plaster of Paris by Medical ...

    plaster of Paris A white powder of dried calcium sulphate dihydrate which, mixed with water, gives off heat and hardens. Reinforced with loose bandage it forms a strong and useful support (CAST) or dental mould. Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

  10. Plaster of Paris - definition of plaster of Paris by The Free ...

    gesso - gypsum or plaster of Paris spread on a surface to make it suitable for painting or gilding (or a surface so prepared) gypsum - a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris) calcium sulfate, calcium sulphate - a white salt (CaSO4)

  11. Properties and Uses of Plaster of Paris Chemistry ...

    Chemically, Plaster of Paris is calcium sulphate hemihydrate. It is called Plaster of Paris because it is obtained from gypsum which is mainly found in Paris. Preparation : Plaster of Paris is obtained by heating gypsum (CaSO 4.2H 2 O) at 373 K in a kiln. Heating should be done 373 K in a kiln.