Calcium sulfate hemihydrate

Catalog Number	ACM10034761-1
CAS	10034-76-1
Structure
Description	Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO4 and related hydrates. In the form of γ-anhydrite (the anhydrous form), 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.
Synonyms	CALCIUM SULFATE CALCINED;CALCINED GYPSUM;Calcium sulfate hemihydrate;CALCIUM SULPHATE 1/2 H₂O;CalciumSulphateDriedBp
IUPAC Name	calcium sulfate hemihydrate
Molecular Weight	290.3
Molecular Formula	CaH₂O5S
Canonical SMILES	O.[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Ca+2].[Ca+2]
InChI	InChI=1S/2Ca.2H2O4S.H2O/c;2*1-5(2,3)4;/h;2*(H2,1,2,3,4);1H2/q2*+2;/p-4
InChI Key	ZOMBKNNSYQHRCA-UHFFFAOYSA-J
Melting Point	1450ºC
Purity	99%+
Appearance	White powder
EC Number	231-900-3
Exact Mass	289.8392057
Hydrogen Bond Acceptor Count	9
Hydrogen Bond Donor Count	1
Monoisotopic Mass	289.8392057
Rotatable Bond Count	0
Topological Polar Surface Area	178 Ų

Q&A

What is molecular formula of calcium sulfate hemihydrate?

(CaSO4)2.H2O

What is Canonical SMILES of calcium sulfate hemihydrate?

O.[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Ca+2].[Ca+2]

What is ICSC Number of calcium sulfate hemihydrate?

1217

What is the specific optical rotation of calcium sulfate hemihydrate?

+6.5°(D/20℃

What are the related applications of calcium sulfate hemihydrate?

Calcium sulfate hemihydrate can be used as a diluent for tablets, capsules, fillers, curing agents for slow-release agents, etc. It can also be used in construction as high-strength gypsum components, plasterboard, casting models and mechanical processing of fixed cementitious processing parts and other aspects.

What is the common method of preparation of calcium sulfate hemihydrate?

The most common preparation method of calcium sulfate hemihydrate is the rotary kiln calcination method. Firstly, the raw gypsum is crushed to l~3mm and then added to the indirectly heated rotary kiln for calcination for 15min, and the final temperature of the material is 140~150℃ (115~125℃ for calcined medical gypsum). The clinker was crushed and screened to produce calcium sulfate hemihydrate.

Whether calcium sulfate hemihydrate is toxic to humans?

Dust of calcium sulfate hemihydrate can cause respiratory diseases. The maximum permissible concentration is 2mg/m3. Respiratory organs should be protected at work by wearing work clothes and protective glasses. Observe personal protective measures and pay attention to dust prevention and dust removal in the workplace.

What is the solubility of calcium sulfate hemihydrate in water?

Grams of calcium sulfate hemihydrate dissolved per 100 ml of water at different temperatures:0.223g/0°C;0.244g/10°C;0.255g/20°CChemicalbook;0.264g/30°C;0.265g/40°C0.244g/60°C;0.234g/80°C;0.205g/100

What is the identification of calcium sulfate hemihydrate?

Add 20mL of 2.7 mol/L hydrochloric acid and 80mL of water to 1g of calcium sulfate, shake well and filter, the filtrate shows sulfate reaction and calcium salt reaction.

Calcium sulfate hemihydrate is soluble in which solvents?

Calcium sulfate hemihydrate is soluble in acids, ammonium salts, sodium thiosulfate and glycerol

What are the aliases for calcium sulfate hemihydrate?

Raw Gypsum, Hard Raw Gypsum, Muriacite, Anhydrous Gypsu

What is the melting point of calcium sulfate hemihydrate?

1193℃