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Description of key information

According to structural properties, hydrolysis is not expected.

Key value for chemical safety assessment

Additional information

The Pigment Orasol Black X51 (EC no. 939-191-9) is a multipartite chromium complex composed of single complex fractions of azo-dye compounds and amine compounds of the mixture Tridecylamine (TDA), branched and linear (CAS 86089-17-0).

Tridecylamine, branched and linear (CAS 86089-17-0) is a mixture composed of (predominantly) groups of isomers with chain lengths ranging from C11 to C14 and, to a minor content, of C10 alkylamines. The following relative distribution of the C10 to C14 alkylamines was confirmed by GC/MS analysis:

      C10-amines: 1% (selected as representative amine compound; reason: shortest alkyl chain)

      C11-amines: 12%

      C12-amines: 16%

      C13-amines: 68% (selected as representative amine compound; reason: main component)

      C14-amines: 3% (selected as representative amine compound; reason: longest alkyl chain)

The assessment of the hydrolysis potential of Orasol Black X51 is additionally based on the available data for the respective azo-dye components without metal complexation (CAS 6434-57-7 and CAS 14847-54-2) as well as for the selected three representative amine compounds of TDA, branched and linear (CAS 86089-17-0).


According to Kollig et al. (1993), Boethling & Mackay (2000) and Harris (1990), the complete complex Orasol Black X51 (EC 939-191-9) as well as its single azo-dye and amine components are generally resistant to hydrolysis because they do not contain any labile functional groups. Therefore, no study on hydrolysis is performed.