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EC number: 219-784-2
CAS number: 2530-83-8
No terrestrial toxicity data are available with the registered substance.
In accordance with Column 2 of REACH Annex X, there is no need to
further investigate the effects of this substance in long-term
terrestrial toxicity studies because, as discussed in guidance R.7.11.6
(ECHA 2017), the quantitative chemical safety assessment (conducted
according to Annex I of REACH) indicates that the Risk Characterisation
Ratio is well below 1, and therefore the risk is already adequately
controlled and further testing is not justifiable.
The silanol hydrolysis product, [3-(2,3-epoxypropoxy)propyl]silanetriol,
upon which the chemical safety assessment is based, is highly water
soluble and has a low log Kow value and therefore, exposure
of and accumulation in the soil compartment is expected to be low.
The substance is not adsorbing (based on log Koc -0.33), has
low bioavailability (based on log Kow <3 (-2.6)). Toxicity to
fish was observed in the short-term aquatic tests, which may be due to
the presence of an epoxide ring which is a known structural alert for
fish. However, invertebrates and algae showed low/no toxicity in short
and long-term tests, therefore, the occurrence of more severe toxic
effects in the terrestrial compartment that were not expressed in the
aquatic studies would be considered unlikely.
The PNEC calculated by the Equilibrium Partitioning Method has been
determined for the purpose of deriving a chemical safety assessment and
the risk characterisation ratios are below 1.
Overall it is concluded that the risk characterisation conclusion is
sufficiently conservative in respect of any uncertainties and therefore
further in 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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