Registration Dossier
Registration Dossier
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EC number: 231-166-4 | CAS number: 7440-58-6
Endpoint summary
Administrative data
Description of key information
Additional information
- melting point : 2233°C
- boiling point : 4603°C
- relative density : 13.31
- water solubility : <0,012 mg/L
- self-ignition temperature : non available
Hafnium is an odourless metal, present in solid state at 20°C and 101.3 kPa under different forms: powder, shot, sponge, crystal bar, single crystals.
Hafnium is a gray, highly lustrous metal of hexagonal structure.
Physical and chemical properties of this substance are :
Flammability properties of Hafnium highly depend on the form and particular size of the metal:
On the basis of experience and studies presented:
hafnium powder is classified"pyr sol. cat 1"(H250: Catches fire spontaneously if exposed to air)
According to the results of the tests (method A 10, 440/2008/CEE regulation) and on the basis of expert judgment:
hafnium shot (particle size <0,8mm) and sponge are considered as highly flammable (R11) following 67/548/EEC regulation, and"flammable solid" category 1 (H 228) according to the 1272/2008/CEE regulation (CLP).
On the basis of experience and results of conducted test, Massive Hf (bars) and electrolytic crystals (particle size >0.8mm) are considered as non flammable
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