Registration Dossier
Registration Dossier
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EC number: 240-464-3 | CAS number: 16415-12-6
Endpoint summary
Administrative data
Description of key information
Additional information
Hexadecyl(trimethoxy)silane (CAS No. 16415-12-6) hydrolyses slowly under environmental conditions (DT50 > 14 d at pH 4-10). The resulting hydrolysis products are hexadecylsilanetriol and methanol.
Taking the hydrolysis half-time into account, the environmental hazard assessment for the aquatic compartment, including waste water treatment plant, is based on the properties of the parent substance in accordance with REACH guidance for Chemical Safety Assessment R.16 (ECHA, 2016).
Hexadecyl(trimethoxy)silane is readily biodegradable but failed the 10-day window (biodegradation of 65% and 81% after 28 and 60 d, respectively). The parent substance and its silanol hydrolysis product exhibit low volatility. Therefore, indirect photodegradation is not an important degradation pathway. The parent substance has low volatility (1E-04 Pa at 20°C) and is barely water-soluble (2.0E-03 mg/L at 20°C). However, it has a high adsorption potential (calculated log Koc between 5.23 and 7.03). Therefore, it is expected to sorb to soil and sediment particles as well as to sewage sludge.
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