Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

The substance is a yellow solid powder at 20 °C and 1013 hPa. The substance has a median particle size of D50 = 51 µm, determined using laser diffraction measurement.

The evaluation of thermal properties was based on a DSC analysis (0-520 °C): the substance does not melt up to 520 °C but decomposes between 395.69 – 402.78 °C (onset = 397.83 °C) with a related energy of 6.23 J/g.

A relative density of 1.6494 ± 0.0006 g/cm3 at 20±0.2 °C was determined using the pycnometer method.

The substance is very soluble in water at room temperature ( 396.9 ± 11.1 g/L at 20.0 ± 0.5 °C) and its partition coefficient (n-octanol/water) stated as Log Pow is Log Pow =-1.819 ± 0.157. For both determination the shake-ask method was used, combined with a validated photometric method.

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 vapour pressure of the test substance is expected to be negligible as the melting point is above 300 °C.

The surface activity is not expected for the substance as it is not a desired property of the material.

The substance is not flammable but a relative self ignition temperature of 262.6 °C was found.

Screening procedure failed to evidence any reason for concern related to explosive properties of the substance, as the only exothermal event detected (395.69 – 402.78 °C) up to 520 °C has a related energy of 6.23 J/g.

The substance is considered not to be potentially oxidising, as the substance is incapable of reacting exothermically with combustible materials on the basis of the chemical structure oxygen atoms are not chemically bonded to nitrogen or oxygen.