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Calcium sulfate hemihydrate

Calcium sulfate hemihydrate Struktur
10034-76-1
CAS-Nr.
10034-76-1
Englisch Name:
Calcium sulfate hemihydrate
Synonyma:
GYPSUM;PLASTER OF PARIS;Dried gypsum;CALCINED GYPSUM;CalciumSulphateDriedBp;CALCIUM SULPHATE 0,5H2O;CALCIUM SULFATE CALCINED;TORAY BLAN GYPSUM(TA-20);CALCIUM SULPHATE 1/2 H2O;CALCIUM SULFATE 0.5-WATER
CBNumber:
CB2210696
Summenformel:
CaH2O5S
Molgewicht:
154.16
MOL-Datei:
10034-76-1.mol

Calcium sulfate hemihydrate Eigenschaften

alpha 
+6.5°(D/20℃
Dichte
2.69 g/cm3
Aggregatzustand
Solid
Farbe
White with a blue, gray or red hue
Wasserl?slichkeit
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]
Dielectric constant
2.5(Ambient)
Stabilit?t:
Stable. Hygroscopic.
CAS Datenbank
10034-76-1
EPA chemische Informationen
Calcium sulfate hemihydrate (10034-76-1)

Sicherheit

S-S?tze: 22-24/25
WGK Germany  1

Calcium sulfate hemihydrate Chemische Eigenschaften,Einsatz,Produktion Methoden

S-S?tze Betriebsanweisung:

S22:Staub nicht einatmen.
S24/25:Berührung mit den Augen und der Haut vermeiden.

Chemische Eigenschaften

white or slightly off-white powder or granules

Allgemeine Beschreibung

Gypsum is a naturally hydrated calcium sulfate. It can also be easily synthesized in a partially hydrated or anhydrous form. The partially hydrated form is called hemihydrate calcium sulfate, while the anhydrous form is called anhydrite (Jorgensen 1994). In the past, a gypsum fiber product made of long, strong, and thin fibers that had good reinforcing properties was used. These fibers were nonabrasive and stable up to a temperature of 1,000°C. They were also stable in mild acids and bases (Virta 1994).

Industrielle Verwendung

Gypsum is the most common sulfate mineral,characterized by the chemical formulaCaSO4 · 2H2O; it shows little variation from thiscomposition.
Gypsum is one of the several evaporite minerals.This mineral group includes chlorides,carbonates, borates, nitrates, and sulfates. Theseminerals precipitate in seas, lakes, caves, andsalt flats due to concentration of ions by evaporation.When heated or subjected to solutionswith very large salinities, gypsum converts tobassanite (CaSO4.H2O) or anhydrite (CaSO4).Under equilibrium conditions, this conversionto anhydrite is direct. The conversion occursabove 42°C in pure water.
Gypsum is used for making building plaster,wallboard tiles, as an absorbent for chemicals,as a paint pigment and extender, and forcoating papers. Natural gypsum of California,containing 15 to 20% sulfur, is used for producingammonium sulfate for fertilizer. Gypsumis also used to make sulfuric acid by heatingto 1093°C in an air-limited furnace. Theresultant calcium sulfide is reacted to yield limeand sulfuric acid. Raw gypsum is also used tomix with portland cement to retard the set.Compact massive types of the mineral are usedas building stones.

Solubility in water

Gypsum is slightly soluble in water. Gypsum is readily soluble in glycerol and sugar solutions and in aqueous solutions of chelating agents, such as EDTA.

l?uterung methode

Its solubility in H2O is 0.2parts/100 at 18.75o. It dehydrates completely >650o. Dry it below 300o to give a solid with estimated pore size ca 38% of volume. Anhydrous CaSO4 (Drierite) has a high affinity for H2O and will absorb 6.6% of its weight of H2O to form the hemihydrate (gypsum). It sets to a hard mass with H2O; hence it should be kept in a tightly sealed container. The solubility of gypsum in H2O is unusual: 0.176% at 0o, 0.209% at 30o, 0.210 at 40o, 0.204 at 50o and 0.200 at 60o. [Hulett J Am Chem Soc 27 49 1905, James & Partington J Chem Soc 107 1019 1915, Namba J Soc Chem Ind 40 2797 1920.]

Calcium sulfate hemihydrate Upstream-Materialien And Downstream Produkte

Upstream-Materialien

Downstream Produkte


Calcium sulfate hemihydrate Anbieter Lieferant Produzent Hersteller Vertrieb H?ndler.

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10034-76-1()Verwandte Suche:


  • CALCINED GYPSUM
  • CALCIUM SULFATE 0.5-WATER
  • CALCIUM SULFATE, 1/2-HYDRATE
  • CALCIUM SULPHATE 1/2 H2O
  • CALCIUMSULFATE BINDER CAB 30
  • CALCIUM SULFATE CALCINED
  • CALCIUM SULFATE CALCINED HEMIHYDRATE
  • CALCIUM SULFATE HEMIHYDRATE
  • SULFURIC ACID-CALCIUM SALT
  • TORAY BLAN GYPSUM(TA-20)
  • Calcium Sulfate Hemihydrate Calcined Powder
  • Dried gypsum
  • Calcium sulfate,medicinal
  • CALCIUM SULFATE HEMIHYDRATE, CALCINATET
  • CALCIUM SULFATE HEMIHYDRATE 98%
  • CalciumSulphateDriedBp
  • CALCIUM SULFATE 1/2 H2O CALCINED
  • Sulfuric acid, calcium salt, hydrate (2:2:1)
  • CALCIUMSULFATE,POWDER,TECHNICAL
  • Calcium sulfate hemihydrate,medicinal
  • Calcium sulfate hemihydrate, 97+%
  • CalciuM sulfate heMihydrate, 97+%, pure
  • CalciuM sulfate heMihydrate puruM, >=97.0%
  • CALCIUM SULPHATE 0,5H2O
  • Calcium Sulfate, Calcined 〔Gypsum〕
  • Calcium sulfate (gypsum powder)
  • Calcium sulfate test solution(ChP)
  • CALCIUM SULFATE, HEMIHYDRATECALCIUM SULFATE, HEMIHYDRATECALCIUM SULFATE, HEMIHYDRATECALCIUM SULFATE, HEMIHYDRATE
  • Calcium sulfate hemihydrate USP/EP/BP
  • Calcium sulfate test solution
  • CALCIUM SULPHATE HEMIHYDRATE Extra Pure
  • GYPSUM
  • PLASTER OF PARIS
  • Calcium sulfate semi-hydrate
  • 10034-76-1
  • CaSO405H2O
  • CaSO412H2O
  • Ca2H2O9S2
  • Inorganic Salts
  • Synthetic Reagents
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