Uranium(IV) oxide

  • Uranium dioxide
Formula
UO2
Structure
Description
Black to brown crystals or powder.
Uses
A nuclear fuel.

Registry Numbers and Inventories.
CAS
1344-57-6
EC (EINECS/ELINCS)
215-700-3
UN (DOT)
2909
Merck
12,9991
Beilstein/Gmelin
9351 (G)
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed

Properties.
Formula
O2U
Formula mass
270.03
Melting point, °C
2176
Density
10.15 g/cm3
Solubility in water
Insoluble
Thermal expansion
0.00001004/K
Heat of fusion
83.29 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
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Do not touch damaged packages or spilled material. Cover liquid spill with sand, earth or other noncombustible absorbent material. Cover powder spill with plastic sheet or tarp to minimize spreading. Contact radiation safety officer.
Stability
Stable under normal temperatures and pressures.
Decomposition
The substance may spontaneously ignite on contact with air when heated above 700 C.

Fire.
Fire fighting
Do not use water. Use dry chemical extinguishing agents, dry sand or dry ground dolomite to fiight fire. Whear a NIOSH/MSHA approved SCBA and full protective equipment.
Fire potential
Extremely flammable. May be pyrophoric.

Health.
Exposure limit(s)
OSHA PEL: 0.2 mg/m3; 0.6 STEL(U)
Exposure effects
   Ingestion
May cause kidney damage and acute necrotic arterial leasions. May also effect the liver.
   Inhalation
Toxic by inhalation. See Ingestion.
   Skin
May cause irritation.
   Eyes
May cause irritation.

First aid
 
   Ingestion
Rinse mouth with water. Seek medical attention.
   Inhalation
Remove to fresh air. Seek medical attention.
   Skin
Immediately wash skin with soap and large amounts of water.
   Eyes
Flush eyes with copious amounts of water for at least 15 minutes. Seek medical attention.

Transport.
UN number
2909
Response guide
Hazard class
7
USCG CHRIS Code
RAD