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| CAS No.: | 2551-62-4 |
|---|---|
| Name: | Sulfur hexafluoride |
| Article Data: | 132 |
| Molecular Structure: | |
|
|
|
| Formula: | S F6 |
| Molecular Weight: | 146.056 |
| Synonyms: | Sulfur fluoride (SF6), (OC-6-11)-;Sulfur fluoride, (OC-6-11)-;Sulfur fluoride;Hexafluorosulfur;Hexafluorure de soufre;SonoVue;Sulphur hexafluoride; |
| EINECS: | 219-854-2 |
| Density: | 6.602 |
| Melting Point: | ?50°C(lit.) |
| Boiling Point: | -64 °C (subl.) |
| Solubility: | slightly in water |
| Appearance: | colourless odourless gas |
| Hazard Symbols: |
 Xi
|
| Risk Codes: | 37 |
| Safety: | 38 |
| Transport Information: | UN 1080 |
| PSA: | 25.30000 |
| LogP: | 3.16940 |
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dithionitronium hexafluoroarsenate
A
- 88446-29-1
bis(difluorothio)nitronium hexafluoroarsenate(V)
B
- 2551-62-4
sulfur(VI) hexafluoride
| Conditions | Yield |
|---|---|
| With fluorosulfonyl fluoride In not given XeF2 was condensed onto a frozen mixure of S2NAsF6 and SO2F2, mixt. wasstirred and shaken for 0.5 h at 0°C, mixt. was stirred at room temp. for 12h; volatiles were removed, product was dissolved in SO2, than SO2 was removed , product was recrystd. from SO2-SO2ClF; elem. anal.; | A 99% B <1 |
- 7664-39-3
hydrogen fluoride
- 7446-09-5
sulfur dioxide
A
- 640723-20-2, 2699-79-8, 12769-73-2
fluorosulfonyl fluoride
B
- 173009-97-7, 118492-84-5, 13709-54-1
thionyl tetrafluoride
C
- 2551-62-4
sulfur(VI) hexafluoride
| Conditions | Yield |
|---|---|
| In hydrogen fluoride byproducts: OF2; Electrolysis; 16°C, 6-8 Volt,; | A 90.4% B n/a C n/a |
| In hydrogen fluoride byproducts: OF2; aq. HF; Electrolysis; 16°C, 6-8 Volt,; | A 90.4% B n/a C n/a |
| Conditions | Yield |
|---|---|
| In further solvent(s) fluorination (N2 carrier gas (ratio F/N2 1:5), 0 to -5°C, als solvent freon-11); low temp. fractional condensation; IR spectroscopy; | 90% |
- 74542-21-5
pentafluoro(fluorochloroamido)sulfur
A
- 74542-22-6
(fluoroamido)pentafluorosulfur
B
- 2551-62-4
sulfur(VI) hexafluoride
| Conditions | Yield |
|---|---|
| With Hg; CF3COOH In neat (no solvent) byproducts: ClHgOC(O)CF3; mixt. warmed in a reactor from -196°C to 0°C and stirred for 5 h; pumped through traps at -78, -110 and -196°C; | A 90% B n/a |
- 7782-41-4
fluorine
- 7704-34-9
sulfur
A
- 5714-22-7
disulfur decafluoride
B
- 13709-35-8
disulfur difluoride
C
- 7783-60-0
sulfur tetrafluoride
D
- 7664-39-3
hydrogen fluoride
E
- 2551-62-4
sulfur(VI) hexafluoride
| Conditions | Yield |
|---|---|
| In neat (no solvent) byproducts: OF2; introduction of F2 into steel chamber, sulfur in compartments; detailed description of apparatus and handling given;; first passing through Ni (or Monel) tube (400°C); second Cu column (H2O sprayed); passed into steel column (containing carbon/Fe shavings; aq. NaOH sprayed); dried in column (containing solid NaOH, BaO or P2O5);; | A n/a B n/a C n/a D n/a E 87% |
- 74542-22-6
(fluoroamido)pentafluorosulfur
- 74542-20-4
(fluoroimido)tetrafluorosulfur
B
- 2551-62-4
sulfur(VI) hexafluoride
| Conditions | Yield |
|---|---|
| With KF In neat (no solvent) byproducts: OSF2, CF3C(O)F, KF*HF; SF5NHF was condensed to the reactor with KF at -196°C, the reactor was held at 0°C for 7 h; pumped through traps at -110, -125 and -196°C; | A 85% B n/a |
- 15930-75-3
thiazyl trifluoride
- 7790-89-8
chlorine monofluoride
- 7782-41-4
fluorine
A
- 79593-52-5
(SF4NCl)2
B
- 74542-21-5
pentafluoro(fluorochloroamido)sulfur
C
- 2551-62-4
sulfur(VI) hexafluoride
| Conditions | Yield |
|---|---|
| In neat (no solvent) The reactor with SF3N and ClF was warmed from -196°C to -78°C over 14 h; addn. of F2, warming; pumped through traps at -78, -115, and -196°C; | A n/a B 75% C n/a |
- 7446-09-5
sulfur dioxide
- 7782-41-4
fluorine
A
- 640723-20-2, 2699-79-8, 12769-73-2
fluorosulfonyl fluoride
B
- 80937-33-3
oxygen
C
- 2551-62-4
sulfur(VI) hexafluoride
| Conditions | Yield |
|---|---|
| In neat (no solvent) heating in cooled copper tube (water) to 650°C; description of apparatus given;; condensed (liquid O2); passed through flasks containing H2O and hot aq. KOH; dried over P2O5;; | A n/a B n/a C 70% |
- 10036-47-2
tetrafluorohydrazine
- 354-67-6
pentafluoro(1,1,2,2,2-pentafluoroethyl)-λ6-sulfane
A
- 75-73-0
carbon tetrafluoride
B
- 76-16-4
Hexafluoroethane
C
- 354-80-3
Perfluoroethylamine
D
- 7783-60-0
sulfur tetrafluoride
E
- 2551-62-4
sulfur(VI) hexafluoride
| Conditions | Yield |
|---|---|
| NF3 formed too; | A n/a B n/a C 70% D n/a E n/a |
| NF3 formed too; | A n/a B n/a C 70% D n/a E n/a |
| Conditions | Yield |
|---|---|
| byproducts: N2; from -78 to 20°C; | A 50% B n/a |
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- Total:22 Page 1 of 1 1
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Chemistry
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Molecular Formula: SF6
Molecular Weight: 146.05 g/mol
Canonical SMILES: S(F)(F)(F)(F)(F)F
InChI: InChI=1/F6S/c1-7(2,3,4,5)6
EINECS: 219-854-2
Classification Code: Diagnostic [ultrasound]
Product Categories: Inorganics; Inorganic Fluorides; Vitamin Ingredients; Chemical Synthesis; Compressed and Liquefied Gases; Synthetic Reagents
Stability: Stable. Non-flammable. Explodes on contact with disilane. Reacts with sodium.
XLogP3-AA: 4.2
H-Bond Acceptor: 6
Exact Mass: 145.96249
MonoIsotopic Mass: 145.96249
Heavy Atom Count: 7
Complexity: 62.7
Melting Point: -50 °C(lit.)
Density: 6.602 g/cm3
Boiling Point: -64 °C (lit.)
Vapor density: 5.11 (vs air)
Vapor pressure: 22 mm Hg ( 21.1 °C)
Water Solubility of Sulfur hexafluoride (CAS NO.2551-62-4): slightly
Uses
Sulfur hexafluoride (CAS NO.2551-62-4) is used in the electrical industry as a gaseous dielectric medium for high-voltage (35 kV and above) circuit breakers, switchgear, and other electrical equipment, often replacing oil filled circuit breakers (OCBs) that can contain harmful PCBs and used in the semiconductor industry as an etchant. Sulfur hexafluoride is also used as a reagent for creating thrust in a closed Rankine cycle propulsion system, reacting with solid lithium as used in the United States Navy's Mark 50 torpedo and used as an alternative to oil in insulating high voltage equipment such as power transformers and switchgear and used to pressurize the waveguide in radar systems. The magnesium industry uses large amounts of SF6 as inert gas to fill casting forms.
Production
SF6 can be prepared from the elements through exposure of S8 to F2. This is also the method used by the discoverers Henri Moissan and Paul Lebeau in 1901. Some other sulfur fluorides are cogenerated, but these are removed by heating the mixture to disproportionate any S2F10 (which is highly toxic, unlike SF6) and then scrubbing the product with NaOH to destroy remaining SF4. There is virtually no reaction chemistry for SF6. It does not react with molten sodium, but reacts exothermically with lithium. Starting from SF4, one can prepare SF5Cl, which is structurally related to SF6. The monochloride is, however, a strong oxidant and readily hydrolyzed to sulfate.
Toxicity Data With Reference
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| rabbit | LD50 | intravenous | 5790mg/kg (5790mg/kg) | Toxicology Letters. Vol. 1000(Sp) |
Consensus Reports
Reported in EPA TSCA Inventory.
Safety Profile
This material is chemically inert in the pure state and is considered to be physiologically inert as well. However, as it is ordinarily obtainable, it can contain variable quantities of the low-sulfur fluorides. Some of these are toxic, very reactive chemically, and corrosive in nature. These materials can hydrolyze on contact with water to yield hydrogen fluoride, which is highly toxic and very corrosive. In high concentrations and when pure it may act as a simple asphyxiant. Incompatible with disilane. Vigorous reaction with disilane. May explode. When heated to decomposition emits highly toxic fumes of F− and SOx.
Hazard Codes: 
Xi
Risk Statements: 37
R37: Irritating to respiratory system
Safety Statements: 38
S38: In case of insufficient ventilation, wear suitable respiratory equipment.
RIDADR: UN 1080 2.2
Hazard Note: Irritant
HazardClass of Sulfur hexafluoride (CAS NO.2551-62-4): 2.2
Standards and Recommendations
OSHA PEL: TWA 1000 ppm
ACGIH TLV: TWA 1000 ppm
DFG MAK: 1000 ppm (6100 mg/m3)
DOT Classification: 2.2; Label: Nonflammable Gas
Specification
Sulfur hexafluoride (CAS NO.2551-62-4), its Synonyms are Sulfur fluoride (SF6), (OC-6-11)- ; Sulfur fluoride, (OC-6-11)- ; Sulfur fluoride ; Hexafluorosulfur ; Hexafluorure de soufre ; SonoVue ; Sulphur hexafluoride . It is colourless odourless gas.