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Sulfur hexafluoride

Chemical Properties Molecular Structure Uses Impact on the environment Acute intravenous toxicity Storage characteristics
Sulfur hexafluoride
Sulfur hexafluoride
CAS No.
2551-62-4
Chemical Name:
Sulfur hexafluoride
Synonyms
SF6;Elegas;Esaflon;OC-6-11;SULFURHEXAFLORIDE;Hexafluorosulphane;sulfurfluoride(sf6);Schwefelhcsafluorid;SULFUR HEXAFLUORIDE;SULFUR HEXAFLOURIDE
CBNumber:
CB7724783
Molecular Formula:
F6S
Formula Weight:
146.06
MOL File:
2551-62-4.mol

Sulfur hexafluoride Properties

Melting point:
−50 °C(lit.)
Boiling point:
−64 °C1 mm Hg(lit.)
Density 
6.602
vapor density 
5.11 (vs air)
vapor pressure 
22 mm Hg ( 21.1 °C)
form 
colorless gas
Water Solubility 
slightly
Merck 
13,9063
Stability:
Stable. Non-flammable. Explodes on contact with disilane. Reacts with sodium.
CAS DataBase Reference
2551-62-4(CAS DataBase Reference)
NIST Chemistry Reference
Sulfur hexafluoride(2551-62-4)
EPA Substance Registry System
Sulfur fluoride (SF6), (OC-6-11)-(2551-62-4)
SAFETY
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  Xi
Risk Statements  37
Safety Statements  38
RIDADR  UN 1080 2.2
WGK Germany  -
RTECS  WS4900000
Hazard Note  Irritant
HazardClass  2.2
Hazardous Substances Data 2551-62-4(Hazardous Substances Data)
Symbol(GHS):
Signal word: Warning
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H280 Contains gas under pressure; may explode if heated Gases under pressure Compressed gas
Liquefied gas
Dissolved gas
Warning P410+P403
Precautionary statements:
P410 Protect from sunlight.

Sulfur hexafluoride price More Price(1)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 295701 Sulfur hexafluoride ≥99.75% 2551-62-4 227g $425 2017-11-08 Buy

Sulfur hexafluoride Chemical Properties,Uses,Production

Chemical Properties

Chemical properties of sulfur hexafluoride are very stable. And compared to selenium hexafluoride, the hydrolysis rate of sulfur hexafluoride is extremely low, this is due to the small radius sulfur atom, which resulting in six fluorine atoms form a larger steric hindrance around. However, the fluorine atom radius is not big, so the repulsive force between the six fluorine atoms is not too large, S-F bond is not easy to dissociate. Enthalpy of formation of sulfur hexafluoride is-1220 kJ/mol, but enthalpy of formation of sulfur hexafluoride is-74 kJ/mol. Thus, the radius of fluorine atom and sulfur atom radius cause the very stable of sulfur hexafluoride molecule together---the molecules themselves are difficult to disconnect bond and break down and the attack group is difficult to approach to the central atom, in the thermodynamics and kinetics, they are both stable. Studies have said sulfur hexafluoride can be stably present in the atmosphere for thousands of years.

Molecular Structure

In VSEPR theory, sulfur hexafluoride molecular configuration is regular octahedron, which shows in Figure 1, the yellow is sulfur atom, the blue is fluorine atom. The hybrid orbital type of sulfur atom in sulfur hexafluoride is generally considered sp3d2. The angles between adjacent S-F bond are all 90 °. S-F bond length is 1.55 Å. The dipole moment is 0, and therefore they are non-polar molecules.

Figure 1 is a sulfur hexafluoride stick model.

Uses

Industry Application Role/benefit
Medicine Anesthesia Anesthetic/better anesthesia effect than nitric oxide
Retinal detachment repair operations Provide a tamponade or plug of a retinal hole in the form of a gas bubble
Ultrasound imaging Contrast agent/enhance the visibility of blood vessels to ultrasound
Semiconductor Plasma etching Etchant/breaking down product fluorine plasma can perform the etching
Metal casting Magnesium and aluminum casting Oxygen asphyxiant/inert and not corrosive and toxic
High-power microwave systems Pressurizes waveguides Insulates the waveguide, preventing internal arcing
Chemical weapon Production of disulfur decafluoride Feedstock
Magic show Object floating show Be colorless, tasteless and has greater density than air
Electrical equipment High-voltage circuit breakers and gas insulated switchgear Gaseous dielectric medium/has much higher dielectric strength than air or dry nitrogen
Others Tennis, insoles filling Gas filler/much lower capacity to pass through rubber membrane than air
Monitor the flow of the water and the diffusion of the air pollutants Tracer agent/ stably exists in water and air
Zanyism Performers breathe a little sulfur hexafluoride gas to make the voice become low and deep
Refrigerant Good chemical stability and no corrosion on the equipment
 

Impact on the environment

Since the high intensity of infrared absorption, sulfur hexafluoride has been identified as a greenhouse gas, and it is the strongest greenhouse gases. 《Kyoto Protocol》indicate human must make great efforts to reduce the emissions of sulfur hexafluoride. Although sulfur hexafluoride in the atmosphere is very stable, when it once dissociate, it will generate S2F10, SF4 and HF and other fluorine-containing molecules, and these are corrosive and toxic substances, some of which are also greenhouse gases.

Acute intravenous toxicity

Rabbit LD50: 5790 mg/kg

Storage characteristics

Treasury ventilation low-temperature drying; Handle gently.

Uses

In electrical circuit interrupters. In electronic ultra-high frequency piping.

Reactivity Profile

This substance undergoes chemical reactions only under relatively severe circumstances. They are resistant to ignition, although they may become flammable at very high temperatures. They may be resistant to oxidation reduction, except in the most severe conditions. These materials may be nontoxic. They can asphyxiate. Contact of very cold liquefied gas with water may result in vigorous or violent boiling of the product and extremely rapid vaporization due to the large temperature differences involved. If the water is hot, there is the possibility that a liquid "superheat" explosion may occur. Pressures may build to dangerous levels if liquid gas contacts water in a closed container [Handling Chemicals Safely 1980].

Health Hazard

Vapors may cause dizziness or asphyxiation without warning. Vapors from liquefied gas are initially heavier than air and spread along ground. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire may produce irritating, corrosive and/or toxic gases.

Fire Hazard

Some may burn but none ignite readily. Containers may explode when heated. Ruptured cylinders may rocket.

Sulfur hexafluoride Preparation Products And Raw materials

Raw materials

Preparation Products


Sulfur hexafluoride Suppliers

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