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REACH

Reaction products of diazotised 4,4-diaminodiphenylamine-2-sulfonic acid, subsequently coupled with 6-amino-4-hydroxynaphthalene-2-sulfonic acid, further diazotised and coupled with metaphenylendiamine, sodium salts

EC number: 939-382-7 | CAS number: -

Life Cycle description
Uses advised against

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Direct Black 22 (DBk22) is an odourless black organic powder.

No endothermic peak corresponding to melting and/or boiling was recorded in a tested temperature range from 25°C to 600°C; thermal decomposition of the test substance in connection with the loss of the mass started at the temperature 210°C (Sbovodova, 2012).

Particle size distribution showed that DBk22 is characterized by particle too large to pass in bronchi and lungs (Nebuloni, 2012).

DBk22 has a high hydrophilic character, due to the presence of three sulphonic acid groups.

The log Pow is -3.25 indicating a very high affility for water in respect than for octanol.

DBk22 is very soluble in water and the substance contains a number of different ionisable groups which don't let measure a reliable univocal pKa. In particular DBK22 is an UVCB substance for which the measurements of pKa is not technically feasible.
DBk22 does not ignite and propagate combustion; no chemical groups associated with explosive and oxidising properties are present in the molecule.

DBk22 does not meet the criteria to be considered as flammable/explosive/oxidising.

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