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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

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Titanium dioxide or Titanium(IV)oxide (TiO2, Molecular Weight 79.88) CAS no. 13463-67-7.


Natural titanium dioxide exists in nature in one of three crystalline forms, the two most important of which are anatase (CAS no. 1317-70-0) and rutile (CAS no. 1317-80-2), the third being brookite (12188-41-9). Rutile is the thermodynamically stable form of titanium dioxide; anatase rapidly transforms to rutile above 700°C.


Melting point: 1560°C (anatase), 1843°C (rutile), 1825°C (brookite)

Relative density: 3.9 (anatase), 4.26 (rutile), 4.17 (brookite)

The following definitions are applicable to the different titanium dioxide grades:

Pigmentary titanium dioxide is composed of primary particles with a mean particle size typically in the range 0.2 to 0.3 microns in diameter.

Nano titanium dioxide is composed of primary particles which are <100 nm in size. These primary particles naturally form aggregates and agglomerates which are above 100 nm.