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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Physical & Chemical properties

Water solubility

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Administrative data

Link to relevant study record(s)

Description of key information

Not relevant; instable in water; hydrolysis products very soluble (500 g HCl/L) or insoluble (< 0.1 µg TiO2/L; ca. 1 nmol Ti(IV)/L)

Key value for chemical safety assessment

Additional information

In accordance with Column 2 of REACH Annex VII, the water solubility study (section 7.7) does not need to be conducted as the substance is hydrolytically unstable at ambient pH (half-life less than 12 hours). It is reactive towards water (Millennium 2007), and on reaction produces hydrochloric acid and insoluble oxides. A precipitate of insoluble titanium dioxide is produced after rapid hydrolysis of titanium tetrachloride (Fisk et al 2010). The solubility of titanium dioxide is reported as < 5 µg/L. (Harvey 2004) and even < 1µg/L (Brouwers 2009).

  • Brouwers T (2009). 24h screening transformation/dissolution test of Chloride reactor discharge at a 100 mg/L loading in a standard aqueous medium at pH 6, 7 and 8. testing laboratory: ECTX consult bvba, Bergstraat 73, B3500 Hasselt/ analytical phase: Servaco nv, tramstraat 2, B8560 wevelgem. Owner company: TDMA (titanium dioxide manufacturers association). Study no. X09-01-014