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EC number: 603-094-7
CAS number: 125904-11-2
The stability of the registered substance was assessed in water at three
pH levels. A 30-day trial was conducted in pH 4, 7 and 9 buffer
solutions at temperatures of 15 and 25°C. DBS was determined to be
hydrolytically stable at 15°C when monitoring DBS with the
monobromostyrene constituent at pH 4, 7 and 9. Based on the
dibromostyrene constituent, DBS was determined to be hydrolytically
stable at pH 4 and 9, but was marginally hydrolytically unstable at pH 9
(t½ = 177 days). Based on the tribromostyrene constituent, DBS was
determined to be hydrolytically stable at pH 7, but was unstable at pH 4
(t1/2 = 46 days) and pH 9 (t½ = 149 days). At 25°C, DBS degraded at all
pH levels. Half-lives based on monobromo-, dibromo- and tribromostyrene
ranged from 39-43, 50-59, and 37-49 days, respectively. Half-lives based
on pH ranged from 37-50 (pH 4), 39-59 (pH 7) and 40-52 (pH 9) days.
Based upon the range and reliability of available information no further
studies were considered to be necessary. The stability of the monomeric
form of the registered substance is not paramount as it is neither
manufactured nor imported into the EU in its monomeric form, and is only
available to industry in it's polymerised form. In view of this exposure
information it is proposed that the stability of the polymer, in which
the registered substance is present, mediates the exposure of the
substance to the environment.
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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