Sulfur hexafluoride

  • Sulfur fluoride
Formula
SF6
Structure
Description
A colorless odorless gas.
Uses
In electrical circuit interrupters, in electronic ultra-high frequency piping.

Registry Numbers and Inventories.
CAS
2551-62-4
EC (EINECS/ELINCS)
219-854-2
RTECS
WS4900000
RTECS class
Other
UN (DOT)
1080
Merck
12,9146
Beilstein/Gmelin
2752 (G)
Swiss Giftliste 1
G-2872
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
F6S
Formula mass
146.05
Melting point, °C
-50.8
Boiling point, °C
-63.7
Vapor pressure, mmHg
9443.51 (0 C)
Vapor density (air=1)
5.1
Critical temperature
45.6
Density
1.07 g/cm3 (50 C)
Solubility in water
30 mg/L
Viscosity
0.037204 cp (627 C)
Partition coefficient, pKow
1.68
Thermal expansion
0.027/K

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Attempt to stop leak if without undue personnel hazard.
Stability
No data.
Incompatibilities
Disilane explodes violently in contact with sulfur hexafluoride. Decomposition occurs at high temp in presence of oxygen with release of irritating decomposition products. Disilane explodes on contact with carbon tetrachloride or sulfur hexafluoride.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
May burn but does not ignite readily.
Hazards
Containers may explode when heated. Ruptured cylinders may rocket.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
TLV: 1000 ppm; 5970 mg/m3 (ACGIH 1997). OSHA PEL: TWA 1000 ppm (6000 mg/m3) NIOSH REL: TWA 1000 ppm (6000 mg/m3)
Poison_Class
-
Exposure effects
Altered hearing, mild excitation, and a peripheral tingling sensation may develop. If displacement of oxygen causes hypoxemia, incoordination, mood disturbances, confusion, headache, or coma could develop. No data were available to assess the teratogenic potential of this agent or its possible effects during pregnancy or lactation.
   Ingestion
Unlikely to occur.
   Inhalation
Air hunger and cyanosis may be noted.
   Skin
Direct contact with the liquified material or escaping compressed gas can cause frostbite injury.
   Eyes
See Skin.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove and isolate contaminated clothing and shoes. In case of contact with liquefied gas, thaw frosted parts with lukewarm water.
   Eyes
If symptoms develop, immediately move individual away from exposure and into fresh air. Flush eyes gently with water for at least 15 minutes while holding eyelids apart; seek immediate medical attention.

Transport.
UN number
1080
Response guide
Hazard class
2.2
Std. Transport #
4904575