Registration Dossier
Registration Dossier
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A mixture of isomers of: 1,1'-[(3,5(or 2,4 or 4,6 or 2,6)-dihydroxy-o(or m or p)-phenylene)bis(azo-meta-phenyleneazo{1-[3-(dimethylamino)propyl]-1,2-dihydro-6-hydroxy-4-methyl-2-oxopyridine-5,3-diyl})]dipyridinium-dichloride-dihydrochloride; 1-(1-[3-(dimethylamino)propyl]-5-{3-[x-(4-{1-[3-(dimethylamino)propyl]-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-5-pyridinio-3-pyridylazo}phenylazo)-2,4(or 2,6 or 3,5 or 4,6)-dihydroxyphenylazo]phenylazo}-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridyl)pyridinium-dichloride-dihydrochloride (where x is variable)
EC number: 404-540-1 | CAS number: 159405-95-5 BRAUN HM 2763; BROWN HM 2763; BRUN HM 2763; BRUNO HM 2763
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
Waiving.
Key value for chemical safety assessment
Additional information
Information on hydrolysis of substance at pH 4, 7 and 9 is required by Annex VIII of the REACH Regulation (EC 1907/2006).
However, the target substance is intended to be used in aqueous solutions in the pH range 3.5 to 9.5 only and it is known from its handling and use that it is stable within these pH limits. Moreover, it is a salt, it completely dissociates in water and it is in its ionic form within the range of pH values 4 -9. In addition, based on the molecular structure, it does not contain groups prompted to hydrolysis.
Overall, the substance is considered as stable to hydrolysis.
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