Registration Dossier
Registration Dossier
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EC number: 402-140-1 | CAS number: 17865-32-6 CHMMS; CHMS; DYNASYLAN 9407; Z-6187
Endpoint summary
Administrative data
Description of key information
Abiotic degradation
Cyclohexyl(dimethoxy)methylsilane hydrolyses in the presence of water with half-life 19 hours at 25°C and pH 7 (read-across, see section 4.1.1.1). A half-life of 1.3 days for reaction with hydroxyl radicals in air has been calculated for cyclohexyldimethoxymethylsilane. However, reaction with water vapour may be a competing degradation process in air.
The hydrolysis products are cyclohexylmethylsilanediol and methanol. A half-life of 0.9 days for reaction with hydroxyl radicals in air has been calculated forcyclohexylmethylsilanediol.
Biotic degradation
The biodegradation of cyclohexyl(dimethoxy)methylsilane has been investigated in four screening studies. The key study is an OECD Guideline 301 D Closed Bottle Test (LSR, 1987a), which showed 17% (based on ThOD) or 20% (based on COD) degradation of cyclohexyldimethoxymethylsilane over 28 days. Cyclohexyl(dimethoxy)methylsilane is therefore considered to be not readily biodegradable.
The chemical safety assessment indicates that it is not necessary to obtain further information on biodegradation via simulation tests in water, sediment or soil.
Additional information
Table 4.4: Degradation rates
Degradation rate in water: |
Hydrolysis half-life:19 hours at 25°C(read-across). No significant biodegradation expected for the silanol hydrolysis product. |
Degradation rate in sediment: |
No significant biodegradation of silanol hydrolysis product expected. |
Degradation rate in soil: |
No significant biodegradation of silanol hydrolysis product expected. |
Degradation rate in air: |
Half-life for reaction with hydroxyl radicals in air: 1.3 days (calculated). Half-life for reaction with hydroxyl radicals in air of silanol hydrolysis product: 0.9 days (calculated). |
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