Calcium Sulfate

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calcium sulfate

[′kal·se·əm ′səl‚fāt]
(inorganic chemistry)
CaSO4 A white crystalline salt, insoluble in water; used in Keene's cement, in pigments, as a paper filler, and as a drying agent.
Either of two hydrated forms of the salt: the dihydrate, CaSO4·2H2O, and the hemihydrate, CaSO4·½H2O.

Calcium Sulfate

 

CaSO4, a salt, existing in nature as the dihydrate CaSO4-2H2O (gypsum, selenite) and in an anhydrous state (anhydrite). Anhydrous calcium sulfate occurs in the form of colorless crystals with a density of 2.96 g/cm3 and a melting point of 1450°C. It combines very slowly with water, exhibiting a poor solubility of 0.2036 g per 100 g H2O at 20°C and 0.067 g at 100°C. The half-hydrate CaSO4-1/2 H2O is known; when mixed with water, it hardens rapidly, converting into CaSO«2H2O. Calcium sulfate is used in the manufacture of figures and casts, as a construction material, and in medicine.

calcium sulfate

Anhydrite or gypsum dihydrate which has been calcined to the point at which all the water of crystallization has been removed.
References in periodicals archive ?
30% weight reduction compared to standard calcium sulphate screeds
Among the alloplastic materials available calcium sulphate has a long history of safe use.
under conditions where both bulk concentration of calcium sulphate and fluid velocity are constant (all terms are defined in the Nomenclature).
Acidified calcium sulphate might be effective in decontaminating the surface of cooked products and to keep contaminants from coming back.
Line of fillers and functional pigments includes clays (water-ground kaolins and bentonites), mica (muscovite and biotite), barytes (natural white and off-white grades), calcium sulphate, calcium carbonate, and the Polytal series of platy talcs designed specifically for polyolefins.
Keywords: phosphoric acid evaporators, calcium sulphate solubility, scale formation, modelling
These include alumina and zirconia ceramics, bioactive glasses and bioactive glass-ceramics, calcium sulphate, tricalcium phosphate-based ceramics, hydroxyapatite, tricalcium phosphate/hydroxyapatite biphasic ceramics, si-substrated hydroxyapatite, calcium phosphate cement, calcium phosphate coating, titania-based materials, ceramic-polymer composites, dental ceramics and dental glass-ceramics.
Tenders are invited for Supply of Chemicals Diethyl Ether, Hexane, Silica Gel with calcium sulphate as binder, Caster Oil, Butanol ( Butan-l-OL), Sodium Molybdate, Hydrazine sulphate, Potassium Dihydrogen phosphate EDTA Powder, Eriochrom Black T (solochrome Black T), Ammonium Chloride Extrapure, Ammonium Bicarbonate ( amm.
This is a chemical process whereby the sulphur oxides produced in carbon combustion processes are captured and washed as they come out of the boilers, they are then coated with limestone which reacts with the sulphur dioxide (SO2) producing a mixture of sulphite and calcium sulphate.
Manufacturing, delivery and installation of lightweight concrete, TrittschalldEnmmschichten, calcium sulphate screed, cement screed.
1 450 mA calcium sulphate heating screed, 320 mA calcium sulphate screed on insulation layer, 150 mA quick-setting cement-heated screed, 35 mA Quick cement heating screed on insulation layer.
Thermoluminescent phosphor material examples are calcium fluoride, lithium fluoride, lithium bromide, and calcium sulphate.