Octasodium 2,2'-[1,4-phenylenebis[imino(6-chloro-1,3,5-triazine-4,2-diyl)imino(1-hydroxy-3,6-disulphonatonaphthalene-2,8-diyl)azo]]bisnaphthalene-1,5-disulphonate

Endpoint summary

Additional information

The substance to be registered is an odourless red powder.

The test item does not melt and boil: in a DSC analysis (SPO STR 028 method, similar to OECD 102) has been noted an endothermic curve from 25 to 260 °C, followed by a decomposition of the product between 275 - 389 °C (onset at 295.2 °C; enthalpy 63 J/g).

Relative density was determined by means of a pycnometer (OECD 109) and the result value was D at 20 °C 1.641.

Granulometry of the sample (SPO STR 071 method) was performed with and without 1 and 2 minutes of ultrasonic treatment.

The substance presented a granulometry (D50 after 2 minutes of ultrasonic treatment of 60.501 µm) that can be considered as inhalable fractions.

According to Annex VII of the REACH Regulation EC n. 1907/2006, Column 2, the study of vapour pressure does not need to be conducted for this substance but the lowest value accepted by EUSES has been reported for a complete Risk assessment (0.0000001 Pa).

Partition coefficient was determined by a Shake Flask Method (OECD 107); the average log Pow measured was – 1.5691 at 20°C.

The tested substance is considered very soluble by OECD 105 (water solubility = 411.28 g/l, mean).

According to Annex VII of the REACH Regulation EC n. 1907/2006, Column 2, no surface activity is expected or can be predicted; therefore the testing can be waived. As solid, the substance has no a flash point and the test can also be waived.

For the substance a potential for spontaneous ignition is not expected for the following reasons:

-Is a non-pyrophoric solid because it does not react with air in small amounts in a more or less instantaneous manner;

-Can be considered as a non-self-heating solid because it does not react with air in large amounts and after an extended period of time;

Furthermore it is produced and used regularly since many years in Europe according to the above qualifications, transported by ship from outside Europe under various conditions and in various amounts. Evidence connected to the long experience in handling and use of the molecule confirms the not spontaneous ignition property. In addition, the substance is soluble in water at room temperature and forms a stable solution with water. No reactions with water or emission of flammable gases have ever been noted. For soluble dyes a reaction with water is not a desirable property from the use point of view.

Therefore it is not classified as a substance which in contact with water may react to emit flammable gases and an experimental determination according to the EC test guideline A.12 do not need to be performed.

Flammability on a similar substance was assessed by EU Method A.10. described in the Regulation EC n. 440/2008, resulted not flammable. The substance under registration is therefore not flammable, based on similarity.

Furthermore evidences connected to the long experience in handling of the substance confirms that no flammable properties have never been observed and reported up to now in the usual conditions of production, stock, transport and use.

After the calculation of the oxygen balance and the evaluation of the exothermic energy (DSC performed) the substance could be considered with no explosive or oxidising properties.