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Physical & Chemical properties

Melting point / freezing point

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Description of key information

Endothermic effetc: 127- 174 °C (onset at 137.7 °C; enthalpy - 4.2 J/g).
Decomposition: > 280 °C

Key value for chemical safety assessment

Additional information

Acid Red 097:1 is a multiconstituent substance composed by the acidic and the sodium salt forms of the same structure (62.1 % and 11.34 % of the substance respectively). EPI Suite v4.10 has been used in order to compare the two structures. The two results, derived from estimation of melting point by means of MPBPVP v1.43, are identical (349.84 °C both for the salt and for the acidic form) due to the great similarity between the two molecules.

Considering the great similarity of the molecules, the composition of the substance and the results of the estimation with EPI Suite v4.10, Acid Red 097:1 is expected to release water/solvent by imbition/cristallization starting from 25 -120 °C, followed by an endothermic effect between 127- 174 °C (onset at 137.7 °C; enthalpy - 4.2 J/g). Decomposition of the product starting from 280 °C.

The smile notations used for the estimations are:


Sodium salt


Acidic form