Registration Dossier

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
oxidising solids
Type of information:
other: Expert assessment
Adequacy of study:
key study
Study period:
July 6, 2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: This assessment is based on a review of the molecular structure (functionality) of calcium titanium trioxide in conjunction with relevant REACH and CLP Regulation
Qualifier:
no guideline required
Principles of method if other than guideline:
A review was undertaken to determine the oxidising potential of calcium titanium trioxide by examining the molecular structure (functionality) of the substance. There are a number of structural features or groups (e.g. halide-oxygen, nitrogen-oxygen) that are commonly associated with oxidising properties. These typically contribute to the combustion of other materials by yielding oxygen. A screening procedure was followed that incorporated aspects of the Registration, Evaluation, Authorisation, and Restriction of Chemicals (REACH) Regulation (EC) No 1907/2006 and the Classification, Labelling, and Packaging (CLP) Regulation (EC) No 1272/2008.
GLP compliance:
no
Key result
Parameter:
other: An assessment was carried out based on an examination of the functionality within the substance, to identify the presence of elements commonly associated with oxidising behaviour.
Remarks on result:
other: Calcium titanium trioxide is not considered to have chemical functionality associated with oxidising behaviour

Titanium dioxide (CAS 13463-67-7; EC 236-675-5) may be present as an impurity in calcium titanium trioxide, however, due to similar principles (e.g. strong Ti-O bond) it is also not expected to be an oxidising agent and, therefore, it does not affect the overall oxidising behaviour of calcium titanium trioxide.

Interpretation of results:
GHS criteria not met
Conclusions:
It was determined by expert assessment that calcium titanium trioxide does not contain chemical functionality typically associated with oxidising behaviour. Subsequently, the registered substance does not require classification as an oxidising agent (CLP Regulation (EC) No 1272/2008).
Executive summary:

To determine the oxidising potential of calcium titanium trioxide, an assessment was undertaken based on examination of molecular structure and functionality. A screening-style procedure was adopted to assess the oxidising behaviour of the registered substance and titanium dioxide, a potential impurity, that took into consideration Section 7.13 of REACH Regulation (EC) No 1907/2006 and CLP Regulation (EC) No 1272/2008. A number of structural features are typically linked with oxidising behaviour, i.e. groups that are capable of contributing to the combustion of other materials, generally by yielding oxygen. Typical oxidising agents contain functional groups such as halide-oxygen groups, nitrogen-oxygen groups and some metal-oxygen complexes.

Calcium titanium trioxide did not contain chlorine or fluorine but oxygen was identified. However, the oxygen present in calcium titanium trioxide was securely bound to titanium atoms. Given that the registered substance is highly insoluble and has a high thermal stability, it is evident that the oxygen atoms will not significantly contribute to oxidising potential. In addition, titanium dioxide is not expected to behave as an oxidising agent because of a strong Ti-O bond.

It can be concluded that calcium titanium trioxide does not have oxidising potential due to a lack of chemical functionality associated with oxidising behaviour. Subsequently, the criteria for classification as an oxidising solid has not been met (CLP Regulation (EC) No 1272/2008) and further study is not required (Annex VII of REACH).

Description of key information

To determine the oxidising potential of calcium titanium trioxide, an assessment was undertaken based on examination of molecular structure and functionality. A screening-style procedure was adopted to assess the oxidising behaviour of the registered substance and titanium dioxide, a potential impurity, that took into consideration Section 7.13 of REACH Regulation (EC) No 1907/2006 and CLP Regulation (EC) No 1272/2008. A number of structural features are typically linked with oxidising behaviour, i.e. groups that are capable of contributing to the combustion of other materials, generally by yielding oxygen. Typical oxidising agents contain functional groups such as halide-oxygen groups, nitrogen-oxygen groups and some metal-oxygen complexes.

Calcium titanium trioxide did not contain chlorine or fluorine but oxygen was identified. However, the oxygen present in calcium titanium trioxide was securely bound to titanium atoms. Given that the registered substance is highly insoluble and has a high thermal stability, it is evident that the oxygen atoms will not significantly contribute to oxidising potential. In addition, titanium dioxide is not expected to behave as an oxidising agent because of a strong Ti-O bond.

It can be concluded that calcium titanium trioxide does not have oxidising potential due to a lack of chemical functionality associated with oxidising behaviour. Subsequently, the criteria for classification as an oxidising solid has not been met (CLP Regulation (EC) No 1272/2008) and further study is not required (Annex VII of REACH).

Key value for chemical safety assessment

Oxidising properties:
non oxidising

Additional information

Justification for classification or non-classification