Registration Dossier
Registration Dossier
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EC number: 242-177-9 | CAS number: 18297-63-7
Endpoint summary
Administrative data
Description of key information
Parent substance: Not readily biodegradable (0% in 28 d, OECD 301 F)
Silanol hydrolysis product: Not readily biodegradable (0% in 28 d, OECD 301 F)
Urea: Ultimately biodegradable (OECD 302 B, OECD SIDS 2002).
Additional information
The registered (parent) substance 1,3-bis(trimethylsilyl)urea 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).
Since the parent substance transforms rapidly, and urea is known to be inherently biodegradable (OECD SIDS, 2002), the available experimental results obtained using the parent substance as test item are thought to reflect the biodegradability of the silanol hydrolysis product rather than that of the parent substance. Therefore, it is concluded that the silanol hydrolysis product trimethylsilanol (CAS No. 1066-40-6) is not readily biodegradable (0% in 28 d, OECD 301 F).
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