Registration Dossier
Registration Dossier
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EC number: 213-926-7 | CAS number: 1067-25-0
Endpoint summary
Administrative data
Description of key information
Degradation rate in water | DT50 (hydrolysis) = 2.6 h for removal of parent. No significant biodegradation of the silanol hydrolysis product is expected. |
Degradation rate in sediment | No significant biodegradation of the silanol hydrolysis product is expected. |
Degradation rate in soil | No significant biodegradation of the silanol hydrolysis product is expected. |
Degradation rate in air | Predicted DT50 (parent) for reaction with hydroxyl radicals in air: 3.5 d Predicted DT50 (silanol) for reaction with hydroxyl radicals in air: 1.2 d |
Additional information
Trimethoxypropylsilane hydrolyses rapidly (DT50 = 2.6 h) to the silanol hydrolysis product propylsilantriol and the alcohol hydrolysis product methanol.
Trimethoxypropylsilane is ‘not readily biodegradable’ based on a reliable study according to EU Method C.4-A (24% in 28 d, DOC, Die-Away Test). The degradation observed in the biodegradation test is likely to be due to the degradation of methanol, which is expected to biodegrade rapidly and makes up 3 out of the 6 carbons in the molecule. The silanol hydrolysis product propylsilanetriol is not expected to biodegrade to any significant extent.
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