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EC number: 236-675-5
CAS number: 13463-67-7
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
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
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