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MSDS

uranium hexafluoride

 





(inorganic chemistry) UF6 Highly toxic, radioactive, corrosive,
colorless crystals; soluble in carbon tetrachloride, fluorocarbons,
and liquid halogens; it reacts vigorously with alcohol, water, ether,
and most metals, and it sublimes; used to separate uranium
isotopes in the gaseous-diffusion process.

Uranium hexafluoride (UF6), referred to as "hex" in the nuclear
industry, is a compound used in the uranium enrichment process
that produces fuel for nuclear reactors and nuclear weapons. It
forms solid grey crystals at standard temperature and pressure
(STP), is highly toxic, reacts violently with water and is corrosive to
most metals. It reacts mildly with aluminium, forming a thin surface
layer of AlF3 that resists further reaction.

Preparation
Milled uranium oreU3O8 or "yellowcake"is dissolved in nitric
acid, yielding a solution of uranyl nitrate UO2(NO3)2. Pure uranyl
nitrate is obtained by solvent extraction, then treated with
ammonia to produce ammonium diuranate ("ADU", (NH4)2U2O7).
Reduction with hydrogen gives UO2, which is converted with
hydrofluoric acid (HF) to uranium tetrafluoride, UF4. Oxidation with
fluorine yields UF6.

Hazards
MSDS ICSC 1250
EU Index 092-002-00-3
EU classification Very toxic (T+)
Dangerous for the environment (N)
R-phrases R26/28, R33, R51/53
S-phrases (S1/2), S20/21, S45, S61
Flash point Non-flammable

International Chemical Safety Cards
URANIUM HEXAFLUORIDE ICSC: 1250
URANIUM HEXAFLUORIDE
Uranium fluoride
UF6
Molecular mass: 352.0

CAS # 7783-81-5
RTECS # YR4720000
ICSC # 1250
UN # 2978


TYPES OF
HAZARD/
EXPOSURE ACUTE HAZARDS/
SYMPTOMS PREVENTION FIRST AID/
FIRE FIGHTING
FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.

In case of fire in the surroundings: powder, carbon dioxide, NO water.

EXPLOSION




EXPOSURE
AVOID ALL CONTACT!
IN ALL CASES CONSULT A DOCTOR!

INHALATION
Corrosive. Burning sensation. Cough. Shortness of breath.
Avoid inhalation of fine dust and mist. Closed system and ventilation.
Fresh air, rest. Artificial respiration if indicated. Refer for medical attention.

SKIN
Corrosive. Skin burns. Pain.
Protective gloves. Protective clothing.
First rinse with plenty of water, then remove contaminated clothes and rinse again. Refer for medical
attention. Wear protective gloves when administering first aid.

EYES
Corrosive. Pain. Severe deep burns.
Face shield 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
Corrosive. Abdominal cramps. Burning sensation. Shock or collapse.
Do not eat, drink, or smoke during work. Wash hands before eating.
Rinse mouth. Do NOT induce vomiting. Give plenty of water to drink. Refer for medical attention.

SPILLAGE DISPOSAL STORAGE PACKAGING & LABELING
Evacuate danger area! Consult an expert! Sweep spilled substance into sealable containers, then remove
to safe place (extra personal protection: complete protective clothing including self-contained breathing
apparatus).
Separated from aromatic compounds, ethanol, food and feedstuffs. Dry. Well closed. Keep in a
well-ventilated room.
Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with
food and feedstuffs.
UN Hazard Class: 7
UN Subsidiary Risks: 8

SEE IMPORTANT INFORMATION ON BACK
ICSC: 1250 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 HEXAFLUORIDE ICSC: 1250




IMPORTANT DATA FOLLOWS


PHYSICAL STATE; APPEARANCE:
COLOURLESS TO WHITE, DELIQUESCENT CRYSTALS.

PHYSICAL DANGERS:


CHEMICAL DANGERS:
The substance decomposes on heating producing toxic fumes of hydrogen fluoride (see ICSC # 0283).
Reacts with aromatic compounds, such as benzene, toluene and xylene. Reacts violently with water and
ethanol. Attacks many metals forming flammable/explosive gas (hydrogen - see ICSC # 0001). Attacks
plastic, rubber and coatings.

OCCUPATIONAL EXPOSURE LIMITS (OELs):
TLV (as U (soluble and insoluble compounds): 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 and by ingestion.

INHALATION RISK:
A harmful contamination of the air can be reached rather quickly on evaporation of this substance at 20C.

EFFECTS OF SHORT-TERM EXPOSURE:
Corrosive. The substance is corrosive to the eyes, the skin and the respiratory tract. The substance may
cause effects on the kidneys , resulting in kidney impairment and tissue lesions. Exposure at low level may
result in death.




PHYSICAL
PROPERTIES
Boiling point: 56C
Relative density (water = 1): 5.09
Solubility in water, g/100 ml at 20C: reaction
Vapour pressure, kPa at 20C: 14.2


ENVIRONMENTAL
DATA


N O T E S
Do NOT take working clothes home. Shipping name: UN 2978: Uranium hexafluoride (low specific activity);
UN 2977: Uranium hexafluoride, fissile (containing more than 1% (235) uranium). Transport Emergency
Card: TEC (R)-70G06-2

 

 

 
 
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