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EC number: 205-746-2
CAS number: 149-74-6
Due to the rapid hydrolysis of the substance, the chemical safely
assessment is based on the silanol hydrolysis product
The hydrolysis half-life of the registration substance is approximately
very rapid therefore the hazard assessment for the terrestrial
compartments is based on the silanol hydrolysis product.
In accordance with Column 2 of REACH Annex IX, there is no need to
further investigate the effects of this substance in a long-term aquatic
toxicity to invertebrates study because, as indicated in guidance
R.18.104.22.168 (ECHA 2016), the quantitative chemical safety assessment
(conducted according to Annex I of REACH) indicates that the Risk
Characterisation Ratio is well below 1, even with due consideration of
contributing uncertainties, and therefore the risk is already adequately
controlled and further testing is not justifiable.
The substance is highly water-soluble, has low bioavailability (based on
log Kow <3 (0.8)) and there is no reason to
expect any specific mechanism of toxicity beyond narcosis. Therefore,
the occurrence of toxic effects that were not expressed in the existing
short-term aquatic studies (conducted at concentrations up to 1000 mg/l)
would be considered unlikely.
A PNEC has been derived for the purpose of chemical safety assessment.
An assessment factor of 1000 was applied to derive the freshwater PNEC,
this high assessment factor to derive the predicted no-effect level
already reflects the typically higher value of a short-term EC50compared
to a long-term EC10. For a narcotic chemical without a
specific mode of toxic action, it is unlikely that the aquatic PNEC
would be significantly over-estimated using this method.
Overall it is concluded that the risk characterisation conclusion is
sufficiently conservative in respect of any uncertainties and therefore
further in vivo testing is not considered necessary.
Details on how the PNEC and the risk characterisation ratio have been
derived can be found in IUCLID Section 6.0 and Chapters 9 and 10 of the
Chemical Safety Report, respectively.
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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