Registration Dossier
Registration Dossier
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EC number: 404-370-8 | CAS number: 126990-35-0 DCPMS; DYNASYLAN 9415; EURENOR 5023; SAN-30; WACKER SILAN CP2-DIMETHOXY; Z-6228
Endpoint summary
Administrative data
Description of key information
Additional information
Abiotic degradation
Dicyclopentyl(dimethoxy)silane is expected to hydrolyse in the presence of water with a hydrolysis half-life of 19 hours at 25°C and pH 7 (OECD 111). A half-life of 1.2 days for reaction with hydroxyl radicals in air has been calculated for dicyclopentyl(dimethoxy)silane. However, reaction with water vapour may be a competing degradation process in air.
The hydrolysis products are dicyclopentylsilanediol and methanol. A half-life of 0.9 days for reaction with hydroxyl radicals in air has been calculated for dicyclopentylsilanediol.
Biotic degradation
The biodegradation of dicyclopentyl(dimethoxy)silane has been investigated in three screening studies. The key study is an OECD 301C MITI(I) test, which indicated that dicyclopentyl(dimethoxy)silane is not readily biodegradable. It is expected that the substance will hydrolyse during the timescale of the test to form initially the silanediol hydrolysis product, dicyclopentylsilanediol, and methanol. Methanol is expected to be readily biodegraded. Dicyclopentylsilanediol is not expected to biodegrade to any significant extent.
The chemical safety assessment indicates that it is not necessary to obtain further information on biodegradation via simulation tests in water, sediment or soil.
Table 4.1.3: Degradation rates
Degradation rate in water: |
Hydrolysis half-life:19 h at 25°C and pH 7 (OECD 111). No significant biodegradation expected for the silanol hydrolysis product. |
Degradation rate in sediment: |
No significant biodegradation in sediment is expected for the silanol hydrolysis product |
Degradation rate in soil: |
No significant biodegradation in soil is expected for the silanol hydrolysis product. |
Degradation rate in air: |
Half-life for reaction with hydroxyl radicals in air for parent substance: 1.2 days (calculated). Half-life for reaction with hydroxyl radicals in air of silanol hydrolysis product: 0.9 days (calculated). |
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