Registration Dossier
Registration Dossier
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EC number: 242-177-9 | CAS number: 18297-63-7
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- Endpoint:
- adsorption / desorption: screening
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- the study does not need to be conducted because the substance has a low octanol water partition coefficient and the adsorption potential of this substance is related to this parameter
Reference
Description of key information
The log Koc was not determined because the registered (parent) substance 1,3-bis(trimethylsilyl)urea
- has a low potential for adsorption based on its low log Kow (< 3.0)
and
- hydrolyses rapidly under environmentally relevant conditions (DT50 < 10 min).
Therefore, the transformation products trimethylsilanol (CAS No. 1066-40-6) and urea (CAS No. 57-13-6) are considered the relevant assessment entities for the environmental hazard and risk assessment.
Key value for chemical safety assessment
Additional information
The registered (parent) substance 1,3-bis(trimethylsilyl)urea has a low log Kow of 2.72 (OECD 117, HPLC) and therefore has a low potential for adsorption. Furthermore, it hydrolyses rapidly under environmentally relevant conditions (DT50 < 10 min at pH 4, 7 and 9, 20 °C, OECD 111) and forms the silanol hydrolysis product trimethylsilanol (CAS No. 1066-40-6) and urea (CAS No. 57-13-6), which are considered the relevant assessment entities for the environmental hazard and risk assessment according to Guidance R.16 (ECHA, 2016).
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.
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