Calcium Sulfate

(redirected from CaSO4)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

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 ?
When limestone is added to the boiler's fluid bed, the limestone undergoes a transformation called calcination, producing calcium oxide (lime) which reacts with the gaseous SO2 and oxygen to form CaSO4, a solid that is chemically stable.