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Diss Factsheets

Ecotoxicological information

Short-term toxicity to fish

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Administrative data

Link to relevant study record(s)

Description of key information

A 96-hour LC50 of >126 mg/L has 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 data for short-term toxicity to fish are available for dichloro(methyl)silane. However a study of short-term toxicity to fish is available for the related substance dimethylsilanediol. Dimethylsilanediol, 1066-42-8, is a close structural analogue of Methylsilanediol, which is the hydrolysis product of Dichloro(methyl)silane, 75-54-7. The hydrolysis half-life of dichloro(methyl)silane indicates that, under conditions relevant to the short-term fish toxicity test, hydrolysis to methylsilanediol 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 between dimethylsilanediol and methylsilandiol is appropriate because both are small molecule alkylsilanols containing Me-Si and HO-Si groups; their properties are expected to be similar.