Calcium Sulfate Hemihydrate

CAS #:

Linear Formula:

CaSO4 • 0.5H2O / (CaSO4)2• H2O

MDL Number:


EC No.:



97% Calcium Sulfate Hemihydrate
Pricing > SDS > Data Sheet >
98% Calcium Sulfate Hemihydrate
Pricing > SDS > Data Sheet >
Calcium Sulfate Hemihydrate, Technical Grade
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Calcium Sulfate Hemihydrate Properties (Theoretical)

Compound Formula H2Cs2O5S2
Molecular Weight 145.15 / 290.28
Appearance White to Light Gray or Yellowish Powder
Melting Point 163 °C
Boiling Point N/A
Density 2.76-2.96 g/cm3
Solubility in H2O 0.30 g/100ml (20 °C)
Crystal Phase / Structure Orthorhombic
Exact Mass 289.839 g/mol
Monoisotopic Mass 289.839 g/mol

Calcium Sulfate Hemihydrate Health & Safety Information

Signal Word N/A
Hazard Statements N/A
Hazard Codes N/A
Flash Point Non-flammable
RTECS Number TP0700000
Transport Information NONH for all modes of transport
WGK Germany 1

About Calcium Sulfate Hemihydrate

High purity Calcium Sulfate HemihydrateCalcium Sulfate Hemihydrate is a moderately water and acid soluble Calcium source for uses compatible with sulfates. Sulfate compounds are salts or esters of sulfuric acid formed by replacing one or both of the hydrogen atoms with a metal. Most metal sulfate compounds are readily soluble in water for uses such as water treatment, unlike fluorides and oxides which tend to be insoluble. Organometallic forms are soluble in organic solutions and sometimes in both aqueous and organic solutions. Metallic ions can also be dispersed utilizing suspended or coated nanoparticles and deposited utilizing sputtering targets and evaporation materials for uses such as solar cells and fuel cells. Calcium Sulfate is generally immediately available in most volumes. Ultra high purity and high purity compositions improve both optical quality and usefulness as scientific standards. Nanoscale elemental powders and suspensions, as alternative high surface area forms, may be considered. We also produce Calcium Sulfate Solution. Additional technical, research and safety information is available. Technical guidance for using Calcium Sulfate in agriculture is also available.

Calcium Sulfate Hemihydrate Synonyms

Calcium sulphate hemihydrate, α (alpha) calcium sulfate hemihydrate, Sulfuric acid calcium salt hemihydrate, Calcium sulfuricum hemihydrate, CAS 26499-65-0, Plaster of Paris, 607-950-0, calcium sulfate/water (2/1), medical grade calcium sulface hemihydrate

Chemical Identifiers

Linear Formula CaSO4 • 0.5H2O / (CaSO4)2• H2O
MDL Number MFCD00010912
EC No. 231-900-3
Beilstein/Reaxys No. N/A
Pubchem CID 3033839
IUPAC Name dicalcium; disulfate; hydrate
SMILES O.[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Ca+2].[Ca+2]
InchI Identifier InChI=1S/2Ca.2H2O4S.H2O/c;;2*1-5(2,3)4;/h;;2*(H2,1,2,3,4);1H2/q2*+2;;;/p-4

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes, and 36,000 lb. tanker trucks.

Related Elements


See more Calcium products. Calcium (atomic symbol: Ca, atomic number: 20) is a Block S, Group 2, Period 4 element with an atomic weight of 40.078. The number of electrons in each of Calcium's shells is [2, 8, 8, 2] and its electron configuration is [Ar]4s2. Calcium Bohr ModelThe calcium atom has a radius of 197 pm and a Van der Waals radius of 231 pm. Calcium was discovered and first isolated by Sir Humphrey Davy in 1808. It is the fifth most abundant element in the earth's crust and can be found in minerals such as dolomite, gypsum, plagioclases, amphiboles, pyroxenes and garnets. In its elemental form, calcium has a dull gray-silver appearance. Calcium is a reactive, soft metal that is a member of the alkaline earth elements. Elemental CalciumIt frequently serves as an alloying agent for other metals like aluminum and beryllium, and industrial materials like cement and mortar are composed of calcium compounds like calcium carbonate. It is also an biologically essential substance found in teeth, bones, and shells. The name "calcium" originates from the Latin word "calics," meaning lime.


See more Sulfur products. Sulfur (or Sulphur) (atomic symbol: S, atomic number: 16) is a Block P, Group 16, Period 3 element with an atomic radius of 32.066. Sulfur Bohr ModelThe number of electrons in each of Sulfur's shells is 2, 8, 6 and its electron configuration is [Ne] 3s2 3p4. In its elemental form, sulfur has a light yellow appearance. The sulfur atom has a covalent radius of 105 pm and a Van der Waals radius of 180 pm. In nature, sulfur can be found in hot springs, meteorites, volcanoes, and as galena, gypsum, and epsom salts. Sulfur has been known since ancient times but was not accepted as an element until 1777, when Antoine Lavoisier helped to convince the scientific community that it was an element and not a compound.


June 18, 2024
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