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EC number: 221-338-7
CAS number: 3069-40-7
Trimethoxy(octyl)silane is expected
to hydrolyse rapidly (half-life at 20-25°C approximately 4 h at pH
7, 0.2 at pH 4 and 0.1 at pH 9; see Section 220.127.116.11). A half-life
of 1.3 days for reaction with hydroxyl radicals in air has been
calculated for trimethoxy(octyl)silane.
The hydrolysis products are
expected to be octylsilanetriol and methanol. A half-life of 0.8 days
for reaction with hydroxyl radicals in air has been calculated for
Based on read-across from an
analogous substance, no significant biodegradation of the silanol
hydrolysis product, octylsilanetriol, is expected.
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 4.1.5 Degradation rates
Degradation rate in water:
Hydrolysis half-life: approximately 4 h at 20-25°C (predicted). No significant biodegradation expected for the silanol hydrolysis product.
Degradation rate in sediment:
Hydrolysis may occur (hydrolysis half-life in water approximately 4 h at 20-25°C (predicted)). No significant biodegradation expected for the silanol hydrolysis product.
Degradation rate in soil:
Degradation rate in air:
Half-life for reaction with hydroxyl radicals in air of the parent substance: 1.3 days (calculated).
Half-life for reaction with hydroxyl radicals in air of silanol hydrolysis product: 0.8 days (calculated).
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