Registration Dossier
Registration Dossier
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EC number: 231-166-4 | CAS number: 7440-58-6
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
Description of key information
Hafnium is marketed in a massive form such as sponge, bar, electrolytic crystal and shot, thus, hafnium can have many particles size distributions depending on the manufacturing process and intended uses. Therefore, it was estimated not relevant to conduct a particle size distribution test.
Additional information
On the basis of column 2 of the REACH regulation on standard information requirements (Annex VII, section 7.14), it is not necessary to conduct a study if the substance is marketed or used in a non solid or non granular form. Hf is marketed in a massive form such as sponge, bar, electrolytic crystal and shot, therefore there is no need to perform this test.
It could be relevant to perform this test on Hf powder form if it is put on the market as such. However, it should be noted that Hafnium can have many particle size distributions depending on the manufacturing process and intended uses. It is therefore not possible to conclude a representative d50 and the value obtained should be individually considered representative.
Thus, the test on powder form was not conducted.
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