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EC number: 300-644-5
CAS number: 93951-21-4
Substance is not hydrolytically stable at pH 7, 9, and 11 at environmental or use-conditions
The structural analogue, Reactive Black 5, was tested for abiotic
degradation according to OECD 111. In addition to pH 4, 7, 9 as required
by the guideline, the substance was also tested at pH 11 (dyeing
conditions) and pH 1.2.
At pH 1.2 and 37°C, there was no abiotic degradation within the 5 days
observation period. At pH 4, 7, 9, and 11, the test substance was not
stable at 50°C. The degradation at pH 4, 7, and 9 were hence
At pH 4, the half-life at 25°C is ca. 5 years; at pH 7, the half-life at
25°C is ca. 2 days; at pH 9, the half-life at 20°C is ca. 50 minutes.
During degradation of the bis-ester, both isoforms of the mono-vinyl
form appear temporarily as degradation product. One main degradation
product is Reactive Black 5 bis-vinyl as the active dye-form which
further hydrolyses to Reactive Black 5-OH.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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