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Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Chromium iron oxide (CAS 12737-27-8) is an inorganic, black, odourless powder.


- The melting point is >1000 °C.


- relative density: 5.13.


- Physical particle size distribution: D10: 1.4 µm, D50: 2.9 µm, D90: 5.9 µm


- Dustiness.


Total dustiness: 31.04 mg/g


MMAD1 = 4.35 µm (20.0 %) , MMAD2 = 61.04 µm (80.0 %)


Geometric standard deviation of MMAD: GSD1 = 1.1, GSD 2 = 9.09


Fractional deposition in human respiratory tract: Head (ET): 51.0 %, Tracheobronchial (TB): 0.9 %, Pulmonary (PU): 2.00 %


- Transformation/Dissolution


Dissolution of Cr and Fe according to OECD 29 after 7 days at 100 mg loading and after 7 and 28 days at 1mg loading is below the L.O.D. (<0.5 µg/L) at pH 6.

Additional information