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URANIUM DIOXIDE (OBSOLETE)ICSC: 1251
Uranous oxide
Black uranium oxide
Uranium oxide (UO2)
Urania
Brown oxide
Uranium(IV) oxide
March 1995
CAS #: 1344-57-6
EC Number: 215-700-3

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Combustible if powdered.    NO open flames, NO sparks and NO smoking.    Use water spray, powder.   

 PREVENT DISPERSION OF DUST! STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR! 
  SYMPTOMS PREVENTION FIRST AID
Inhalation Cough.  Avoid inhalation of dust. Use ventilation (not if powder), local exhaust or breathing protection.  Fresh air, rest. 
Skin   Protective gloves.  Remove contaminated clothes. Rinse and then wash skin with water and soap. 
Eyes Redness. Pain.  Wear safety goggles or eye protection in combination with breathing protection if powder.  Rinse with plenty of water (remove contact lenses if easily possible). 
Ingestion   Do not eat, drink, or smoke during work.  Rinse mouth. 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Evacuate danger area! Sweep spilled substance into sealable containers. If appropriate, moisten first to prevent dusting. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

skull;toxiccancer;health hazenviro;aqua
DANGER
Very toxic to aquatic life
Toxic to aquatic life with long lasting effects
May cause damage to organs through prolonged or repeated exposure 

Transportation
UN Classification
 

STORAGE
Well closed. Store only in original container. Cool. 
PACKAGING
 
URANIUM DIOXIDE (OBSOLETE) ICSC: 1251
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
BLACK-TO-BROWN CRYSTALS OR POWDER. 

Physical dangers
No data. 

Chemical dangers
The substance may ignite spontaneously on contact with air when heated above 700°C. 

Formula: UO2
Molecular mass: 270.0
Melting point: 2847°C
Relative density (water = 1): 11.0
Solubility in water: none 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
Exposure mainly occurs via inhalation. 

Effects of short-term exposure
The substance is irritating to the eyes. 

Inhalation risk
A harmful concentration of airborne particles can be reached quickly when dispersed, especially if powdered. 

Effects of long-term or repeated exposure
Repeated or prolonged inhalation of dust particles may cause effects on the lungs. 


OCCUPATIONAL EXPOSURE LIMITS
TLV: (as U): 0.2 mg/m3, as TWA; 0.6 mg/m3 as STEL; A1 (confirmed human carcinogen); BEI issued 

ENVIRONMENT
 

NOTES
Insufficient data are available on the effect of this substance on human health, therefore utmost care must be taken.
Do NOT take working clothes home. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: T+, N; R: 26/28-33-51/53; S: (1/2)-20/21-45-61; Note: A 

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