Registration Dossier
Registration Dossier
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EC number: 263-319-6 | CAS number: 61916-41-4
Melting point / freezing point
Administrative data
Link to relevant study record(s)
Description of key information
No melting point recorded, up to approximately 300 °C
Key value for chemical safety assessment
Additional information
The test item melting point was determined using the Differential Scanning Calorimetry (DSC) according to Directive EC n. 440/2008 Method A.1., OECD Test Guideline 102 (1995). Between 50 and 87 °C an endothermic reaction was observed, with an intensity of -56.4 J/g. A second endothermic reaction was recorded between 137 and 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.
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