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 ?
With the exception of the cited species (Figure 1), the highest growth of plants was provided by elemental sulfur followed by calcium sulfate.
Treatment of nonunions and osseous defects with bone graft and calcium sulfate.
The experiment had a factorial and consisted of 16 treatments resulting from the combination of two factors; four concentrations of calcium sulfate (CaS[O.
Transient solute concentrations and phase changes of calcium sulfate in aqueous sodium chloride.
Finnish chemicals group Kemira Oyj reported on Thursday (21 June) that it will be increasing its production of calcium sulfate pigments in Siilinjarvi, Finland.
Calcium sulfate is especially soluble in vivo, serving as a calcium source for mineral formation.
Calcium sulfate hemihydrate (CSH, CaSO4 x 1/2 H2O) powders are currently being produced as a bone substitute, and many corporations such as Smith & Nephew and Wright Medical Technology are marketing self-setting, orthopedic cements based on pure CSH.
A combination of acidic calcium sulfate, lactic acid, ethanol, sodium dodecyl sulfate and polypropylene glycol also reduced the number of C.
High concentrations of calcium sulfate (the majority constituent mineral in drywall), under anaerobic conditions, can produce hydrogen sulfide gas.
In an effort to avoid these complications, orthopaedic surgeons explored the use of substitutes ranging from calcium sulfate to boiled xenographic bone.
5] samples were alkaline and composed primarily of calcium-based compounds such as calcium sulfate (gypsum) and calcium carbonate (calcite).
Numerous needles of calcium sulfate dihydrate reaction product are present in the hydrated systems.