International Chemical Safety Cards

URANIUM DIOXIDE ICSC: 1251
URANIUM DIOXIDE
Uranous oxide
Black uranium oxide
UO2
Molecular mass: 270.0
CAS # 1344-57-6
ICSC # 1251
TYPES OF
HAZARD/
EXPOSURE 		ACUTE HAZARDS/
SYMPTOMS 		PREVENTION FIRST AID/
FIRE FIGHTING
FIRE Combustible.
NO open flames.
Water spray, powder.
EXPLOSION


 
EXPOSURE
PREVENT DISPERSION OF DUST! STRICT HYGIENE!
IN ALL CASES CONSULT A DOCTOR!
INHALATION
Avoid inhalation of fine dust and mist. Ventilation (not if powder), local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention.
SKIN
Protective gloves.
Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention.
EYES Redness. Pain.
Safety goggles or eye protection in combination with breathing protection if powder.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
INGESTION
Do not eat, drink, or smoke during work. Wash hands before eating.
Rinse mouth. Refer for medical attention.
SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING
Sweep spilled substance into sealable containers; if appropriate, moisten first to prevent dusting. Then remove to safe place (extra personal protection: P3 filter respirator for toxic particles).
Well closed.

SEE IMPORTANT INFORMATION ON BACK
ICSC: 1251 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993

International Chemical Safety Cards

URANIUM DIOXIDE ICSC: 1251

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PHYSICAL STATE; APPEARANCE:
BLACK TO BROWN CRYSTALS OR BLACK TO BROWN POWDER.

PHYSICAL DANGERS:


CHEMICAL DANGERS:
The substance may spontaneously ignite on contact with air when heated above 700°C.

OCCUPATIONAL EXPOSURE LIMITS (OELs):
TLV (as U): ppm; 0.2 mg/m3 (as TWA); 0.6 mg/m3 (STEL) (ACGIH 1994-1995).


ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its aerosol.

INHALATION RISK:
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly on spraying or when dispersed, especially if powdered.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance irritates the eyes.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Lungs may be affected by repeated or prolonged exposure to dust particles.
PHYSICAL
PROPERTIES
 Melting point: 2865°C
Relative density (water = 1): 11.0		 Solubility in water: none
ENVIRONMENTAL
DATA
N O T E S
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


ICSC: 1251 URANIUM DIOXIDE
© IPCS, CEC, 1993
IMPORTANT LEGAL NOTICE: Neither the CEC or the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use.