Reaction mass of sodium 7-hydroxy-8-((E)-(4-(1-(4-((E)-(4-hydroxyphenyl)diazenyl)phenyl)cyclohexyl)phenyl)diazenyl)naphthalene-1,3-disulfonate and sodium 8,8'-(1E,1'E)-(4,4'-(cyclohexane-1,1-diyl)bis(4,1-phenylene))bis(diazene-2,1-diyl)bis(7-hydroxynaphthalene-1,3-disulfonate)

Endpoint summary

Description of key information

The substance is a dark red organic powder at 1013 hPa and 20 °C.

Between 36 and 123 °C, there is an endothermic reaction associated to the release of water/ solvent, followed by a decomposition that begins at 123 °C; therefore boiling point is not recorded.

The relative density was determined by means of a pycnometer and recorded at 1.672 at 20 °C.

The particle size distribution was analyzed using the Mastersizer 2000 tool and the MMD resulted was 32.643 µm.

The substance is soluble in water (107.88 g/l at 20 °C and pH 9.40) and Kow value was calculated as 0.1619 (average log Pow: -0.7968), showing affinity with the water phase, than the octanol phase.

Based on the physicochemical properties, vapour pressure, surface tension and flash point can be neglected.

The substance is not auto-flammable, flammable and explosive and it is deemed to be potentially not oxidising based on the chemical structure, the negative oxygen balance values and the known experience in the handling and use.