Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

On the basis of annex XI of REACh regulation, the present endpoint could be waived based on:

  • the lack of toxic effects shown in the available acute aquatic toxicity tests with HfO2 used for read-across: no observed effects in any of the tests for acute toxicity to algae, aquatic invertebrates and fish.
  • the extremely low water solubility of HfO2 <5 µg/L (see water solubility in section 4.8. for HfO2 used for read across)
  • and its affinity to form complexes with organic matter (Kd values are reported for Hf metal, with a range of 1500 – 8500 L/kg: that show a strong affinity of the metal for particulate matter)

These last two points make the major degradation product HfO2 not bioavailable to aquatic organisms ; it is not relevant to conduct a bioconcentration test.