Uranium hexafluoride

  • Radioactive material, Uranium hexafluoride, non-fissile or fissile excepted
  • Uranium hexafluoride, fissile excepted
  • Uranium hexafluoride, low specific activity
  • Uranium hexafluoride, non-fissile
Formula
UF6
Structure
Description
A colorless volatile radioactive crystalline solid. Radioactive. Emits high energy rays which may be harmful and are detectable only by special instruments.
Uses
Gaseous diffusion process for separating isotopes of uranium.

Registry Numbers and Inventories.
CAS
7783-81-5
EC (EINECS/ELINCS)
232-028-6
RTECS
YR4720000
RTECS class
Other
UN (DOT)
2977
Merck
12,9992
Beilstein/Gmelin
2923 (G)
Austrailia AICS
Listed

Properties.
Formula
F6U
Formula mass
352.02
Melting point, °C
64
Sublimation point, °C
56
Vapor pressure, mmHg
129 (20 C)
Vapor density (air=1)
12
Critical temperature
230.2
Critical pressure
45.5
Density
5.09 g/cm3 (20 C)
Solubility in water
174 g/L (25 C)
Viscosity
0.00026 P (200 C)
Heat of fusion
16.7 kJ/mol

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
Escape; Respirator class(es): any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted acid gas canister having a high-efficiency particulate filter. Any appropriate escape-type, self-contained breathing apparatus.
Small spills/leaks
Contact the local, state, or Department Of Energy Radiological Response Team. Do not use water on material itself. Use water spray to knock-down vapors. Do not apply water to point of leak in tank car or container. Keep material out of water sources and sewers.
Stability
Volatile crystals.
Incompatibilities
React vigorously with aromatic hydrocarbons (benzene, toluene, xylenes), undergoes a violent reaction with water or alcohols (methanol, ethanol) Reacts with most metals.
Decomposition
When heated to decomposition it emits toxic fumes of hydrogen fluoride. Decomposed by water, ethanol and et2o.

Fire.
Fire fighting
Contact the local, state, or Department Of Energy Radiological Response Team. Do not use water on material itself. If large quantities of combustibles are involved, use water in flooding quantities as spray and fog. Use water spray to knock-down vapors. Use foam, dry chemical, or carbon dioxide. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Non-flammable.
Hazards
Substance does not burn. Containers in protective overpacks (horizontal cylindrical shape with short legs for tie-downs), are identified with AF or B(U)F on shipping papers or by markings on the overpacks. They are designed and evaluated to withstand severe conditions including total engulfment in flames at temperatures of 800 degrees C (1475 degrees F). Bare filled cylinders, identified with UN2978 as part of the marking, may rupture in heat of engulfing fire; bare empty (except for residue) cylinders will not rupture in fires. The material may react violently with fuels. Radioactivity does not change flammability or other properties of materials.
Combustion products
Toxic gases and vapors (such as.

Health.
Exposure limit(s)
TLV (as U (soluble and insoluble compounds): ppm; 0.2 mg/m3 (as TWA); 0.6 mg/m3 (STEL) (ACGIH 1994-1995).
Exposure effects
Prenatal ionizing radiation exposure may cause congenital anomalies, mental retardation, and an increased incidence of seizures.
   Ingestion
See Inhalation.
   Inhalation
Dyspnea, bronchospasm (with abnormal pfts and hypoxia), chemical pneumonitis, pulmonary edema (can be hemorrhagic), tracheobronchitis, upper airway obstruction, chemical burns (larynx, trachea, bronchi) and ards may occur following inhalation.
   Skin
See Inhalation.
   Eyes
See Inhalation.

First aid
 
   Ingestion
See Inhalation.
   Inhalation
Medical problems take priority over radiological concerns. Use first aid treatment according to the nature of the injury. Do not delay care and transport of a seriously injured person. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult. Effects of exposure may be delayed.
   Skin
Remove all exposed clothing and jewelry taking necessary precautions to prevent secondary exposure to health care providers. Irrigate exposed areas promptly with copious amounts of water for at least 30 minutes. Wash the skin, including hair and nails, vigorously; do repeated soap washings. Discard contaminated clothing.
   Eyes
Immediately flush with running water for at least 20 minutes. See Inhalation.

Transport.
UN number
2977
Response guide
Hazard class
7
PRTC
T
Std. Transport #
4929114