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CAS No.: | 7778-18-9 |
---|---|
Name: | Calcium sulfate |
Molecular Structure: | |
Formula: | CaSO4 |
Molecular Weight: | 136.14 |
Synonyms: | Calciumsulfate (6CI);A 30 (sulfate);Basic calcium sulfate;CA 5(sulfate);CAS 20;CAS 20-4;Calcium sulfate (1:1);Calcium sulfate (CaSO4);Calmatrix;Capset;CoCoat P 80HB;Crysalba;D 1;D 1(sulfate);D 101A;D 101A (sulfate);Denka Sigma 1000;Drierite;Franklin FiberH 45;Oparex 10;Osteoset;Raddichem 27;SSS-A;Sulfuric acid calcium salt;Sulfuric acid calcium(2+) salt (1:1); |
EINECS: | 231-900-3 |
Density: | 2.96 g/ cm3 |
Melting Point: | 1450 °C |
Boiling Point: | 330 °C at 760 mmHg |
Appearance: | white powder or granules |
Hazard Symbols: | T,N,Xi |
Risk Codes: | 49-42/43-51/53-36/37 |
Safety: | 53-22-36/37-45-60-24/25-36-26 |
Transport Information: | UN 3077 9/PG 3 |
PSA: | 88.64000 |
LogP: | -0.25720 |
Molecular Structure of Calcium sulfate (CAS NO.7778-18-9):
IUPAC Name: calcium sulfate
Empirical Formula: CaSO4
Molecular Weight: 136.1406
H bond acceptors: 4
H bond donors: 2
Freely Rotating Bonds: 0
Polar Surface Area: 82.98Å2
Enthalpy of Vaporization: 62.94 kJ/mol
Boiling Point: 330 °C at 760 mmHg
Vapour Pressure: 3.35E-05 mmHg at 25°C
InChI
InChI=1/Ca.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2
Smiles
S(=O)(=O)([O-])[O-].[Ca+2]
EINECS: 231-900-3
Melting point: 1450 °C
Storage temp: Store at RT.
Sensitive Moisture Sensitive
Merck: 14,1706
Stability: Stable. Incompatible with aluminium, strong acids
Product Categories: Inorganics; Calcium Salts; CalciumMetal and Ceramic Science; Inorganic Salts; Salts; Synthetic Reagents
Synonyms: Anhydrous calcium sulfate ; Anhydrous gypsum ; Anhydrous sulfate of lime ; Basic calcium sulfate ; Calcium sulfate (1:1) ; Calcium sulfate, anhydrous ; Franklin Fiber H 45 ; Sulfuric acid, calcium salt (1:1) ; Surfuric acid calcium(2+) salt (1:1)
Calcium sulfate (CAS NO.7778-18-9) is a common laboratory and industrial chemical. In the form of γ-anhydrite (the nearly anhydrous form), it is used as a desiccant. It is also used as a coagulant in products like tofu.
Hazard Codes: T,N,Xi
Risk Statements: 49-42/43-51/53-36/37
R49:May cause cancer by inhalation.
R42/43:May cause sensitization by inhalation and skin contact.
R51/53:Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
R36/37:Irritating to eyes and respiratory system.
Safety Statements: 53-22-36/37-45-60-24/25-36-26
S53:Avoid exposure - obtain special instructions before use.
S22:Do not breathe dust.
S36/37:Wear suitable protective clothing and gloves.
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
S60:This material and its container must be disposed of as hazardous waste.
S24/25:Avoid contact with skin and eyes.
S36:Wear suitable protective clothing.
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
RIDADR: UN 3077 9/PG 3
WGK Germany: 1
RTECS: WS6920000
F: 3
OSHA PEL: Total Dust: 15 mg/m3; Respirable Fraction: 5 mg/m3
ACGIH TLV: TWA (nuisance particulate) 10 mg/m3 of total dust (when toxic impurities are not present, e.g., quartz <1%)
DFG MAK: 6 mg/m3
Heating gypsum to between 100 °C and 150 °C (302 °F) partially dehydrates the mineral by driving off approximately 75% of the water contained in its chemical structure. The temperature and time needed depend on ambient partial pressure of H2O. Temperatures as high as 170 °C are used in industrial calcination, but at these temperatures γ-anhydrite begins to form.
In the natural state, unrefined Calcium sulfate (CAS NO.7778-18-9) is a translucent, crystalline white rock. The hemihydrate (CaSO4.~0.5H2O) is better known as plaster of Paris, while the dihydrate (CaSO4.2H2O) occurs naturally as gypsum. The main sources of Calcium sulfate (CAS NO.7778-18-9) are naturally occurring gypsum and anhydrite which occur at many locations worldwide as evaporites. These may be extracted by open-cast quarrying or by deep mining. World production of natural gypsum is around 127 million tonnes per annum.