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2551-62-4

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Identification

Name
Sulfur hexafluoride
CAS
2551-62-4
Synonyms
LEAK DETECTION STANDARD LD-1
SULFUR HEXAFLUORIDE
SULFURYL HEXAFLUORIDE
SULPHUR HEXAFLUORIDE
(OC-6-11)-Sulfurfluoride
(oc-6-11)-sulfurfluoride(sf6
Elegas
Esaflon
Hexafluorure de soufre
hexafluoruredesoufre
hexafluoruredesoufre(french)
OC-6-11
Schwefelhcsafluorid
SF6
sulfurfluoride(sf6)
sulfurhexafluoride,highpurity
sulfur hexafluoride cyl. with 4.75 kg (~net)
Sulphurhexafluoride2
SULFUR HEXAFLOURIDE
SULFUR HEXAFLUORIDE, 99.75+%
EINECS(EC#)
219-854-2
Molecular Formula
F6S
MDL Number
MFCD00011447
Molecular Weight
146.06
MOL File
2551-62-4.mol

Chemical Properties

Appearance
Colorless gas; odorless. Slightly soluble in water; soluble in alcohol and ether. Noncombustible.
Appearance
colourless odourless gas
Appearance
Sulfur hexafluoride is a colorless, odorless gas. Shipped as a liquefied compressed gas.
Melting point 
−50 °C(lit.)

mp 
−50 °C(lit.)

Boiling point 
−64 °C1 mm Hg(lit.)

bp 
−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
Stability:
Stable. Non-flammable. Explodes on contact with disilane. Reacts with sodium.
Water Solubility 
slightly
Merck 
13,9063
CAS DataBase Reference
2551-62-4(CAS DataBase Reference)
NIST Chemistry Reference
Sulfur hexafluoride(2551-62-4)
EPA Substance Registry System
2551-62-4(EPA Substance)

Safety Data

Hazard Codes 
Xi
Risk Statements 
R37:Irritating to the respiratory system.
Safety Statements 
S38:In case of insufficient ventilation, wear suitable respiratory equipment .
RIDADR 
UN 1080 2.2

WGK Germany 
-

RTECS 
WS4900000

Hazard Note 
Irritant
DOT Classification
2.2 (Nonflammable gas)
HazardClass 
2.2
Safety Profile
This material is chemically inert in the pure state and is considered to be physiologcally inert as well. However, as it is ordinarily obtainable, it can contain variable quantities of the lowsulfur 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 Fand SOx.
Hazardous Substances Data
2551-62-4(Hazardous Substances Data)

Raw materials And Preparation Products

Hazard Information

General Description
A colorless odorless gas. Noncombustible. Shipped as a liquefied gas under own vapor pressure. Contact may cause frostbite. Under prolonged exposure to fire or heat the containers may rupture violently and rocket.
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.
Potential Exposure
May contain highly toxic sulfur pentafluoride as an impurity. SF6 is used in various electric power applications as a gaseous dielectric or insulator. The most extensive use is in high-voltage transformers. SF6 is also used in waveguides, linear particle accelerators; Van de Graaff generators; chemically pumped continuous-wave lasers; transmission lines; and power distribution substations. Nonelectrical applications include use as a protective atmosphere for casting of magnesium alloys and use as a leak detector or in tracing moving air masses. Several sources note that vitreous substitution of SF6 in owl monkeys results in a greater ocular vascular permeability than that caused by saline. This implies that SF6 could have an important use in retinal surgery.
Fire Hazard
Some may burn but none ignite readily. Containers may explode when heated. Ruptured cylinders may rocket.
First aid
Eye: If eye tissue is frozen, seek medical attention immediately; if tissue is not frozen, immediately and thoroughly flush the eyes with large amounts of water for at least 15 minutes, occasionally lifting the lower and upper eyelids. If irritation, pain, swelling, lacrimation, or photophobia persist, get medical attention as soon as possible. Skin: If frostbite has occurred, seek medical attention immediately; do NOT rub the affected areas or flush them with water. In order to prevent further tissue damage, do NOT attempt to remove frozen clothing from frostbitten areas. If frostbite has NOT occurred, immediately and thoroughly wash contaminated skin with soap and water. Breathing: If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. If breathing has stopped, perform mouth-to-mouth resuscitation. Keep the affected person warm and at rest. Get medical attention as soon as possible.
Shipping
UN1080 Sulfur hexafluoride, Hazard Class: 2.2; Labels: 2.2-Nonflammable compressed gas. Cylinders must be transported in a secure upright position, in a wellventilated truck. Protect cylinder and labels from physical damage. The owner of the compressed gas cylinder is the only entity allowed by federal law (49CFR) to transport and refill them. It is a violation of transportation regulations to refill compressed gas cylinders without the express written permission of the owner.
Incompatibilities
May contain impurities that cause it to hydrolyze on contact with water, forming corrosive and toxic hydrogen fluoride. Vigorous reaction with disilane.
Description
Sulfur hexafluoride is a colorless, odorless, nontoxic, nonflammable gas that has a high dielectric strength and serves widely as an insulating gas in electrical equipment. At atmospheric pressures it sublimes directly from the solid to the gas phase and does not have a stable liquid phase unless under a pressure of more than 32 psia (221 kPa, abs). It is shipped as a liquefied compressed gas at its vapor pressure of 298 psig at 70°F (2050 kPa at 21.1°C).
One of the most chemically inert gases known, it is completely stable in the presence of most materials to temperatures of about 400°F (204°C) and has shown no breakdown or reaction in quartz at 900°F (482°C). Sulfur hexafluoride is slightly soluble in water and oil. No change in pH occurs when distilled water is saturated with sulfur hexafluoride.
Waste Disposal
Return refillable compressed gas cylinders to supplier. Seal unused cylinders and return to suppliers.
Physical properties
Colorless, odorless gas; density 6.41 g/L; about five times heavier than air; liquefies at -50.7°C (triple point); density of liquid 1.88 g/mL at -50.7°C; sublimes at -63.8°C; critical temperature 45.54°C; critical pressure 37.13 atm; critical volume 199 cm3/mol; slightly soluble in water; soluble in ethanol.
Preparation
Sulfur hexachloride may be prepared by reacting fluorine with sulfur or sulfur dioxide.
Brand name
SonoVue (for the microbubble formulation) (Ausimont).
Hazard
Asphyxiant.
Materials Uses
Sulfur hexafluoride is noncorrosive to all metals. It may be partially decomposed if subjected to an electrical discharge. Some of the breakdown products are corrosive; this corrosion is enhanced by the presence of moisture or at high temperature. Sulfur hexafluoride decomposes very slightly in the presence of certain metals at temperatures in excess of 400°F (204°C); this effect is most pronounced with silicon and carbon steels. Such breakdown, presumably catalyzed by the metals, is only several tenths of 1 percent over 1 year. Decomposition at elevated temperatures does not occur with aluminum, copper, brass, and silver.
Most common gasket materials, including Teflon, neoprene, and natural rubber are suitable for sulfur hexafluoride service.
storage
All ofthe precautions necessary for the handling of any nonflammable gas must be taken.

Material Safety Data Sheet(MSDS)

Questions And Answer

Chemical Properties
Sulfur hexafluoride is a colorless, odorless, nontoxic, nonflammable gas that has a high dielectric strength and serves widely as an insulating gas in electrical equipment. At atmospheric pressures it sublimes directly from the solid to the gas phase and does not have a stable liquid phase unless under a pressure of more than 32 psia (221 kPa, abs). It is shipped as a liquefied compressed gas at its vapor pressure of 298 psig at 70°F (2050 kPa at 21.1 0C).
One of the most chemically inert gases known, it is completely stable in the presence of most materials to temperatures of about 400°F (204°C) and has shown no breakdown or reaction in quartz at 900°F (482°C). Sulfur hexafluoride is slightly soluble in water and oil. No change in pH occurs when distilled water is saturated with sulfur hexafluoride.
sulfur hexafluoride structure
sulfur hexafluoride structure
GRADES AVAILABLE
Sulfur hexafluoride is available for commercial and industrial use in various grades (minimum 99.8 mole percent) having much the same component proportions from one producer to another.
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
 

Physiological Effects
Sulfur hexafluoride is completely nontoxic, and in fact has been used medically with humans in cases involving pneumoperitoneum, the introduction of gas into the abdominal cavity. It can act as a simple asphyxiant by displacing the amount of oxygen in the air necessary to support life.
Lower fluorides of sulfur, some of which are toxic, may be produced if sulfur hexafluoride is subjected to electrical discharge. Personnel must guard against the inhalation of the gas after electrical discharge.
ACGIH recommends a Threshold Limit Value-Time-Weighted Average (TLV-TWA) of 1000 ppm (5970 mg/m3 ) for sulfur hexafluoride. The TLV- TWA is the time-weighted average concentration for a normal 8-hour workday and a 40-hour workweek, to which nearly all workers may be repeatedly exposed, day after day, without adverse effect.
OSHA lists an 8-hour Time-Weighted Average- Permissible Exposure Limit (TWA-PEL) of 1000 ppm (6000 mg/m3 ) for sulfur hexafluoride. TWA-PEL is the exposure limit that shall not be exceeded by the 8-hour TWAin any 8-hour work shift ofa 40-hour workweek.
METHOD OF MANUFACTURE
Sulfur hexafluoride is made commercially by the direct fluorination of molten sulfur. Some higher and lower toxic fluorides formed in the process are removed, and the commercial product is more than 99.5 mole percent pure. A high-purity etchant grade is also available for the electronics industry. Common impurities include small amounts of carbon tetrafluoride, nitrogen, and water vapor.
Acute intravenous toxicity
Rabbit LD50: 5790 mg/kg
Storage characteristics
Treasury ventilation low-temperature drying; Handle gently.

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