Disodium [3-[4,5-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonato(3-)][1-[[2-hydroxy-5-(phenylazo)phenyl]azo]-2-naphtholato(2-)]chromate(2-)

Endpoint summary

Additional information

The substance is a metal-complex compound and at 20 °C and 1013 hPa it is a brown powder. Using the laser light scattering method, the mass median diameter value for its particles was found to be 60.987 µm.

The evaluation of thermal properties was based on a DSC analysis: a melting point and a boiling point were not detected; the substance decomposes between 329 °C and 446 °C.

The relative density value found using a pycnometer method was 1.532 at 20 °C.

The substance is very soluble in water at room temperature and it forms a stable solution with water. The average water solubility value was 331.60 g/l at 20 °C and at pH 7.85.

The P_ow value is 0.2206 is the log P_ow value was -0.6632. These results were obtained at 20 °C and at pH 5.83.

No reactions with water or emission of flammable gases have ever been noted. Furthermore, for soluble dyes a reaction with water is not a desirable property from the use point of view. Therefore, the substance is not expected as a substance that in contact with water may react emitting flammable gases.

The substance is also an air-stable compound at room temperature over a prolonged period of time (days), without noticeable or undesirable reactions: a potential for spontaneous ignition is not expected. In addition, it is found to be non flammable during the reference test.

Despite the substance contains chemical groups associated with explosive properties, the substance was classified non explosive and incapable of reacting exothermically with combustible materials, on the basis of its thermal properties and the calculated oxygen balance.