Calcium Sulfate Hemihydrate

Base Information

• Chemical Name: Calcium Sulfate Hemihydrate
• CAS No.: 10034-76-1
• Deprecated CAS: 31745-33-2
• Molecular Formula: Ca.H2O4S.1/2H2O
• Molecular Weight: 145.15
• Hs Code.: 2833299090
• European Community (EC) Number: 600-067-1,607-950-0
• ICSC Number: 1217
• UNII: 3RW091J48V
• DSSTox Substance ID: DTXSID90894798
• Wikipedia: Plaster of paris
• Wikidata: Q27115003
• NCI Thesaurus Code: C80892
• Mol file: 10034-76-1.mol

Synonyms:Alabaster;Anhydrous Sulfate of Lime;Artificial Dental Stone;Calcium Sulfate;Calcium Sulfate (1:1), Dihydrate;Calcium Sulfate (1:1), Hemihydrate;Calcium Sulfate (2:1);Calcium Sulfate Dihydrate;Calcium Sulfate, Anhydrous;Calcium Sulfate, Dihydrate;Calcium Sulfate, Hemihydrate;Calcium Sulphate;Dental Gypsum;Dental Stone, Artificial;Drierite;Gypsite;Gypsum;Gypsum, Dental;Karstenite;Plaster of Paris;Stone, Artificial Dental

Chemical Property of Calcium Sulfate Hemihydrate

Chemical Property:

• Appearance/Colour: white powder
• Melting Point: 1450oC
• Boiling Point: 330 °C at 760 mmHg
• PSA: 97.87000
• Density: 2.69 g/cm3
• LogP: -0.32150
• Water Solubility.: sets to hard mass when mixed with H2O [MER06]; g/100g solution H2O: 1.23 (0°C), 0.71 (25°C), 0.189 (100°C); solid phase, CaSO4 · 1/2H2O [KRU93]
• Hydrogen Bond Donor Count: 1
• Hydrogen Bond Acceptor Count: 9
• Rotatable Bond Count: 0
• Exact Mass: 289.8392057
• Heavy Atom Count: 13
• Complexity: 62.2

Purity/Quality:

99% ^*data from raw suppliers

Calcium sulfate hemihydrate purum, ≥97.0% ^*data from reagent suppliers

Safty Information:

• Safety Statements: 22-24/25

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Chemical Classes: Mineral Dusts -> Other Mineral Dusts
• Canonical SMILES: O.[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Ca+2].[Ca+2]
• Inhalation Risk: A nuisance-causing concentration of airborne particles can be reached quickly when dispersed, especially if powdered.
• Effects of Short Term Exposure: May cause mechanical irritation.
• Description: Calcium sulfate hemihydrate (CaSO4 ? 0.5H2O) is the dehydrated product of gypsum, calcium sulfate dihydrate (CaSO4?2H2O). It is obtained by heating gypsum to approximately 150°C. It is known as gypsum plaster or plaster of Paris (POP). On adding water, it solidifies by an exothermic reaction into hydrated calcium sulphate. It is commonly used to precast and hold parts of ornamental plasterwork placed on ceilings and cornices. Plaster of Paris casts can be used as a treatment of fractures to immobilize the limb. It is also used as a desiccant, and in medicine as a tablet excipient.