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HAFNIUM POWDERICSC: 0847
May 2010
CAS #: 7440-58-6
UN #: 2545 (powder, dry)
EC Number: 231-166-4

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Flammable. See Chemical dangers  Finely dispersed particles form explosive mixtures in air. Risk of fire and explosion. See Chemical Dangers.  NO open flames, NO sparks and NO smoking.  Do NOT expose to friction or shock. Closed system, dust explosion-proof electrical equipment and lighting. Prevent deposition of dust.  Use special powder, dry sand, water in large amounts.   

 STRICT HYGIENE!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation   Avoid inhalation of dust. Use closed system.  Fresh air, rest. 
Skin   Protective gloves.  Rinse contaminated clothes (fire hazard) with plenty of water. Remove contaminated clothes. Rinse and then wash skin with water and soap. 
Eyes Redness.  Wear safety spectacles.  Rinse with plenty of water (remove contact lenses if easily possible). 
Ingestion   Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Remove all ignition sources. Evacuate danger area! Consult an expert! Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Wet powder to prevent dusting and ignition. Sweep spilled substance into covered water-filled containers. Then store and dispose of according to local regulations. Do NOT wash away into sewer. Do NOT absorb in saw-dust or other combustible absorbents. 

According to UN GHS Criteria

flam;flame
DANGER
Catches fire spontaneously if exposed to air 

Transportation
UN Classification
UN Hazard Class: 4.2; UN Pack Group: I 

STORAGE
Fireproof. Separated from strong oxidants, strong acids and halogens. Keep under inert gas. Store only in original container. 
PACKAGING
 
HAFNIUM POWDER ICSC: 0847
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
GREY POWDER. 

Physical dangers
Dust explosion possible if in powder or granular form, mixed with air. 

Chemical dangers
The substance may ignite spontaneously on contact with air. May decompose on shock, friction or concussion. May explode on heating. Reacts violently with halogens, strong acids and strong oxidants. This generates explosion hazard. 

Formula: Hf
Atomic mass: 178.5
Boiling point: 4602°C
Melting point: 2227°C
Relative density (water = 1): 13.31
Solubility in water: none
Auto-ignition temperature: 20°C  


EXPOSURE & HEALTH EFFECTS

Routes of exposure
 

Effects of short-term exposure
 

Inhalation risk
 

Effects of long-term or repeated exposure
 


OCCUPATIONAL EXPOSURE LIMITS
TLV: 0.5 mg/m3, as TWA 

ENVIRONMENT
 

NOTES
Insufficient data are available on the effect of this substance on human health, therefore utmost care must be taken.
Powder is normally handled wetted with no less than 25% of water to reduce the fire and explosion risk. UN number 2545 is for dry powder, according to the specification of the powder Packing Group can be either I, II, or III. The GHS classification will also vary according to the specification of the powder. Other UN number is: 1326 HAFNIUM POWDER, WETTED with not less than 25% water; class 4.1; packing group: II. 

ADDITIONAL INFORMATION
  EC Classification
 

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    See Also:
       Toxicological Abbreviations