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EC number: 240-521-2
CAS number: 16470-24-9
The Stilbene Fluorescent Whitening Agents
(SFWA), also sometimes referred to as stilbene optical or fluorescent
brighteners, are treated as members of a category, comprising the
following fifteen substances (CAS numbers): 4404-43-7, 16090-02-1,
13863-31-5, 4193-55-9, 70942-01-7, 27344-06-5, 42355-78-2, 67786-25-8,
28950-61-0, 16324-27-9, 16470-24-9, 17958-73-5, 41098-56-0, 68971-49-3,
52301-70-9. Of the fifteen category members, fourteen were registered
under REACh. For these fourteen registered substances tests were
conducted according to the data requirements of the associated tonnage
band. According to the general rules for grouping of substances and
read-across approach laid down in Annex XI, Item 1.5, of Regulation (EC)
No 1907/2006, substances may be considered as a category provided that
their physicochemical, toxicological and ecotoxicological properties are
likely to be similar or follow a regular pattern as a result of
structural similarity. The substances within the category are based on
these principles are considered to apply to these general rules. In
addition some of the proposed members where firstly assessed within the
chemical category of Stilbene Fluorescent Whitening Agents recognized
under the framework of the US HPV Chemical Challenge Program. In each
case of read-across, the best suited read-across was chosen where
possible, or a weight of evidence approach in accordance with Annex XI,
Item 1.2, of Regulation (EC) No 1907/2006. Nevertheless, as it can be
seen in the data matrix of the category justification in IUCLID Section
13, all reliable data in the category support the hazard assessment of
each category member by showing a consistent pattern of results.
For a detailed reference list please refer
to the CSR or IUCLID section 13.
The test substance is a solid with very
low vapour pressure, very high solubility and low Kow. It has been
estimated as hydrolytically stable at pH 4, 7 and 9 at 50 °C and it has
an estimated half-life period longer than one year at 25 °C at pH 4, 7
and 9. The substance has not hydrolysable chemical groups in the
Based on calculations according to AOPWIN
v1.92, the substance is indirectly photodegraded by reaction with
hydroxyl radicals in the atmosphere with half-lives of about 0.53 hours
taking into account a 12 -h day and a mean OH radical concentration of
The substance is a member of the Stilbene
Fluorescent Whitening Agents category and based on the data on analogous
substances in the category it is estimated to undergo direct
photodegradation in surface waters, with half-lives ranging from about
to 4 to 5 hours in the photic zone of lakes and rivers. Field
measurements combined with mathematical modelling of sedimentation and
photolysis show that direct photolysis is the only pathway of
degradation and effective throughout the aquatic zone due to the
dynamics of rivers and layers in lakes. There is no indication of
Adsorption will partially bring the
substance onto the surface of suspended particles and will also
contribute to the adsorption of the substance into sediments, where an
anaerobic degradation process can be effective. Nevertheless this is
unlikely to occur in the usual conditions of use, where the substance is
adsorbed to the sludge in the STP, therefore significant release into
surface waters is not expected and exposure of sediment is thereby unlikely.
The substance has been estimated as not
bioaccumulative based on the log Kow and the testing results on similar
substances in the category.
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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