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Physical & Chemical properties

Boiling point

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Description of key information

No boiling point recorded, up to approximately 300 °C

Key value for chemical safety assessment

Additional information

The test item thermal behaviour was assayed using the Differential Scanning Calorimetry (DSC). Between 50 -87 °C an endothermic reaction has been observed, with an intensity of -56.4 J/g. A second endothermic reaction has been recorded between 137 - 172 °C associated to an intensity of -17.8 J/g. A third endothermic peak can be observed at 229 - 279 °C with an energy of -28.2 J/g.

The first reaction at 50 - 87 °C can be attribute to the water/solvent release. Both the second and third peaks cannot be associated to melting/boiling reaction, based on the endothermic energy involved and the curve-shape. The onset of the third peak (at 232.30 °C) seem to be the beginning of a decomposition reaction.

Based on data on the analogous substances Similar Substance 01, Similar Substance 02 and Similar Substance 02b, it is expected that the substance undergo to decomposition before melting (at ca 250 -330 °C). In general, chromate-pyrazol derivaties share the thermal behaviour described; they are substances characterized by several aromatic rings, in resonance, which determine the colour aspect of the dye (its primary function). The actual energy of the molecule in resonance is lower than might be expected for any of the contributing structures.