Tellurium hexafluoride

  • Tellurium(VI) fluoride
Formula
TeF6
Structure
Description
Tellurium hexafluoride is a colorless gas with a repulsive odor.

Registry Numbers and Inventories.
CAS
7783-80-4
EC (EINECS/ELINCS)
232-027-0
RTECS
WY2800000
RTECS class
Other
UN (DOT)
2195
Merck
12,9277
Beilstein/Gmelin
2601 (G)
Swiss Giftliste 1
G-2905
Canada DSL/NDSL
NDSL
US TSCA
Listed
Korea ECL
Listed

Properties.
Formula
F6Te
Formula mass
241.59
Melting point, °C
-37.6
Sublimation point, °C
-38.9
Vapor density (air=1)
8.3
Critical temperature
83
Density
4.006 g/cm3 (-191 C) (solid), 2.499 g/cm3 (-10 C) (liquid)
Solubility in water
Reacts slowly

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
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability
Decomposes in hot and cold water, acid and alkali.
Incompatibilities
Avoid contact with water.
Decomposition
Toxic gases and vapors (such as hydrogen fluoride) may be released when tellurium hexafluoride decomposes. When heated to decomposition it emits very toxic fumes of hydrogen fluoride and tellurium.

Fire.
Fire fighting
Keep unnecessary people away; isolate hazard area and deny entry. Stay upwind; keep out of low areas. Ventilate closed spaces before entering them. Wear positive pressure breathing apparatus and full protective clothing. Do not get water inside container. Move container from fire area if you can do so without risk. Stay away from ends of tanks. Spray cooling water on containers that are exposed to flames until well after fire is out. Isolate area until gas has dispersed.This material is not combustible. Small fires: dry chemical or carbon dioxide. Large fires: water spray, fog or foam.
Fire potential
Nonflammable
Hazards
Container may explode in heat of fire. When heated to decomposition, it emits very toxic fumes of fluoride and tellurium. Decomposes in water, acid, and alkali.
Health
2

Health.
Exposure limit(s)
NIOSH REL: TWA 0.02 ppm (0.1 mg/m3) OSHA PEL: TWA 0.02 ppm (0.2 mg/m3) IDLH 1 ppm
Poison_Class
1
Exposure effects
Rapid breathing and dyspnea have been observed in animals exposed to tellurium hexafluoride. Headache has been reported from exposure to tellurium hexafluoride. Drowsiness has been seen as a symptom after human exposure to tellurium compounds. Malaise, weakness, and dizziness have also been seen. Lassitude may occur. Neuropathies have been reported in animals exposed to tellurium compounds.
   Ingestion
Anorexia, nausea, vomiting, garlicky odor, metallic taste, and constipation have occurred from exposure to tellurium compounds. The garlic odor may occur from other routes of exposure besides ingestion.
   Inhalation
Tellurium hexafluoride is a respiratory irritant. It has produced signs of pulmonary edema and respiratory depression in animals, but this has not been documented in humans.
   Skin
Tellurium hexafluoride is highly irritating to the skin and mucous membranes. Dermatitis and blue-black skin discoloration have been reported to occur from exposure to tellurium hexafluoride. Alopecia has been reported after ingestion of tellurium.
   Eyes
Headache was reported following an exposure to hydrogen telluride. Dry mouth and throat have also been seen after exposure to this compound. Hair loss occurred in one case of acute intoxication.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Effects may be delayed.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
2195
Response guide
Hazard class
2.3
PRTC
T
USCG CHRIS Code
TEH
 
Std. Transport #
4920188