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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

There are no test data for the substance. A 72-hour EC50 value of >118 mg/L and a NOEC of ≥118 mg/L have however been determined for the effects of a read-across substance (Dimethylsilanediol; CAS No. 1066-42-8) on growth rate of Pseudokirchnerella subcapitata.

Key value for chemical safety assessment

Additional information

No test data are available for toxicity of dichloro(methyl)(vinyl)silane (CAS 124-70-9) to algae and cyanobacteria. 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.