Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Hematite chromium green black (CAS 68909-79-5) is an inorganic, green, odourless powder.

- Melting point > 1000 °C

- relative density: 4.93.

- Particle size distribution: d10 = 1.4 µm, d50 = 3.8 µm, d90 = 8.7 µm

- Dustiness:

total: 41.02 mg/g

MMAD= 11.92 µm, GSD= 4.10

Fractional deposition in human respiratory tract: Head (ET): 55.2 %, Tracheobronchial (TB): 1.4 %, Pulmonary (PU): 4.00 %

- The transformation/dissolution

The dissolved concentrations of chromium and aluminium at a 1 mg/l loading after 7 and 28 days were below the LOD (0.5 µg/L) and therefore not determinable.

The dissolved concentrations of chromium at a 100 mg/l loading after 7 days were below the LOD (0.5 µg/L) .

The dissolved concentrations of aluminium at a 100 mg/l loading after 7 days were 2.4 µg/L .

Additional information