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
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).
Trimethylsilanol
The silanol hydrolysis product trimethylsilanol (TMS) is considered to be a stable degradant of the registered (parent) substance. It is characterized by a high, estimated water solubility of 1000 g/L (QSAR) and an estimated vapour pressure of 1850 Pa (QSAR). It is not readily biodegradable but has a low, estimated log Kow of 1.14 (QSAR), and a low estimated log Koc in the range of 0.99 to 1.64 (QSAR), indicating a low potential for bioaccumulation and adsorption to soil and sediment. Based on its properties, trimethylsilanol is expected to predominantly partition to the water column. The SimpleTreat model v4.0 predicts 99.07% of the substance to partition to water and the remaining fraction to air (0.33%), the primary settler (0.39%) and surplus sludge (0.21%).
Urea
Urea is well described in the public domain. It is expected to primarily distribute into the water (99.84%) and air (0.16%) compartments, based on modeling results (Mackay level 1). However, according to worldwide use patterns, the highest environmental exposure is to soil because of its wide use as fertilizer. Environmental exposure by consumer use is considered insignificant (OECD SIDS, 2002).
Reference
OECD SIDS (2002); Urea, CAS 57-13-6, SIAM 2 Final Assessment Report, UNEP Publications
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