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Ecotoxicological information

Short-term toxicity to fish

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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 reliable data for short-term toxicity to fish are available for dichloro(dimethyl)silane. However a reliable study of short-term toxicity to fish is available for the related substance dimethylsilanediol. Dichloro(dimethyl)silane, CAS 75-78-5, hydrolyses to dimethylsilanediol, CAS 1066-42-8. The hydrolysis half-life of dichloro(dimethyl)silane (<<1 min at pH 7 and 25°C) indicates that, under conditions relevant to ecotoxicity assessment, it will hydrolyse to dimethylsilanediol. The other hydrolysis product is hydrogen chloride. Effects of hydrogen chloride on aquatic organisms are limited to those that result from changes to pH in unbuffered media and are discussed in the endpoint summary: ecotoxological discussion, consideration of the non-silanol hydrolysis product.