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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

There are no test data for the substance. A 96-hour LC50 of >126 mg/L and a NOEC of ≥126 mg/L has however been determined for the effects of a read-across substance (Dimethylsilanediol; CAS No. 1066-42-8) on mortality of Oncorhynchus mykiss.

Key value for chemical safety assessment

Additional information

No test data are available for short-term toxicity of dichloro(methyl)(vinyl)silane (CAS 124-70-9) to fish. Reliable data are however available for the read-across substance, dimethylsilanediol (CAS 1066-42-8). Dimethylsilanediol is a close structural analogue of methyl(vinyl)silanediol, which is the hydrolysis product of dichloro(methyl)(vinyl)silane. The hydrolysis half-life of dichloro(methyl)(vinyl)silane indicates that, under conditions relevant to the acute fish toxicity test, hydrolysis to methyl(vinyl)silanediol and hydrogen chloride will occur. The properties of hydrogen chloride are well characterised and are discussed in the CSR. Its effects on aquatic organisms are limited to those that result from changes to pH in unbuffered media. Read-across from dimethylsilanediol to methyl(vinyl)silanediol is appropriate because both are small molecule alkylsilanols whose properties are dominated by presence of the silanediol group.