Hf
(powder)
ICSC # 0847
CAS # 7440-58-6
RTECS # MG4600000
UN # 2545 (powder, dry); 1326 (powder, wetted with water)
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Flammable.
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NO open flames, NO sparks, and NO smoking.
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Special powder.
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Explosion
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Finely dispersed particles form explosive mixtures in air.
Risk of fire and explosion (see Chemical Dangers).
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Do NOT expose to friction or shock.
Prevent deposition of dust; closed system, dust explosion-proof electrical equipment and lighting.
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Exposure
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PREVENT DISPERSION OF DUST!
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•Inhalation
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Avoid inhalation of fine dust and mist.
Local exhaust or breathing protection.
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•Skin
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Protective gloves.
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Remove contaminated clothes.
Rinse and then wash skin with water and soap.
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•Eyes
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Redness.
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Safety spectacles.
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•Ingestion
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Do not eat, drink, or smoke during work.
Wash hands before eating.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Evacuate danger area!
Consult an expert!
Remove all ignition sources.
Do NOT wash away into sewer.
Do NOT absorb in saw-dust or other combustible absorbents.
Wet powder to prevent dusting and ignition, then carefully collect powder into sealable containers. Remove to a safe place.
(Extra personal protection: P2 filter respirator for harmful particles).
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Fireproof.
Separated from
strong oxidants,
strong bases,
halogens, phosphorous and sulfur.
Keep under water.
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UN Hazard Class: 4.2 (dry); 4.1 (wetted)
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Important Data
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Physical State; Appearance:
GREY POWDER.
Physical Dangers:
Dust explosion possible if in powder or granular form, mixed with air.
Chemical Dangers:
May explosively decompose on shock, friction, or concussion.
May explode on heating.
The substance may spontaneously ignite on contact with air and at higher temperatures with nitrogen, phosphorous and sulphur.
Reacts violently with strong acids, strong oxidants, halogens
causing explosion hazard.
Occupational Exposure Limits:
TLV: 0.5 mg/m3 (as TWA) (ACGIH 1995-1996).
MAK: IIb (not established but data is available) (DFG 2008).
OSHA PEL*: TWA 0.5 mg/m3 *Note: The PEL also applies to other hafnium compounds (as Hf).
NIOSH REL*: TWA 0.5 mg/m3 *Note: The REL also applies to other hafnium compounds (as Hf).
NIOSH IDLH: 50 mg/m3 (as Hf) See: 7440586
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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 when dispersed.
Effects of Short-Term Exposure:
Effects of Long-Term or Repeated Exposure:
Lungs may be affected by repeated or prolonged exposure.
The substance may have effects on the liver.
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Physical
Properties
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Boiling point: 4602°C
Melting point: 2227°C
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Relative density (water = 1): 13.31
Solubility in water: none
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Environmental
Data
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N O T E S
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Powder is normally handled wetted with no less than 25% of water to reduce the fire and explosion risk.
Health effects of exposure to the substance have not been investigated adequately.
Rinse contaminated clothes (fire hazard) with plenty of water.
Transport Emergency Card: TEC (R)-41G13
Card has been partially updated in November 2008: see Occupational Exposure Limits.
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ADDITIONAL INFORMATION
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ICSC: 0847
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HAFNIUM POWDER
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
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.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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