PHYSICAL STATE; APPEARANCE:
GRAY 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 (OELs):
TLV: ppm; 0.5 mg/m3 (as TWA) (ACGIH 1995-1996).
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)
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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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