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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

No data are available on the short-term toxicity of the registered substance to fish. A 96-hour LC50 value of >500 mg/L and NOEC of ≥500 mg/L have however been determined for the effects of a read-across substance, Triethoxy(methyl)silane (CAS 2031-67-6), on mortality of Brachydanio rerio. It is likely that the test organisms were primarily exposed to the hydrolysis products of the substance. The measured data is supported by predictions for the hydrolysis product methylsilanetriol (96-h LC50 value of 100000 mg/l).

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Additional information

No data are available on the short-term toxicity of the registered substance to fish. However, data are available for the read-across substance , triethoxy(methyl)silane (CAS 2031-67-6). Triethoxy(methyl)silane (CAS 2031-67-6), hydrolyses in contact with water at pH 7 (half-life approx. 5.5 hours), producing ethanol and methylsilanetriol. The properties of ethanol are well characterized; it is non-toxic to the environment and it is considered unlikely that its presence would significantly affect the results of tests performed with Triethoxy(methyl)silane. Since both substances share the same silanol product it is considered appropriate to read across the available data on triethoxy(methyl)silane.The measured data is supported by predictions for the hydrolysis product methylsilanetriol (96-h LC50 value of 100000 mg/l).