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No test data are available for Chlorotrimethylsilane. Reliable short-term aquatic toxicity tests results are however available for a read-across substance (Trimethylsilanol (CAS 1066-40-6)). Trimethylsilanol and hydrogen chloride are the hydrolysis products of Chlorotrimethylsilane. A 96-hour LC50 value of 271 mg/L (nominal concentration) has been determined for the effects of Trimethylsilanol on mortality of Oncorhynchus mykiss. A 48-hour EC50 value of 124 mg/L (nominal concentration) has been determined for the effects of Trimethylsilanol on mobility of Daphnia magna. A 72 EC50 value of >1053 mg/L and NOEC of 70 mg/L (initial measured concentration) have been determined for the effects of Trimethylsilanol on growth rate of Selenastrum capricornutum (new name: Pseudokirchnerella subcapitata). The same algal test results expressed in terms of mean measured concentrations were >750 mg/L and 50 mg/L respectively. An EC50 value of 6670 mg/l (nominal) for the toxicity to microorganisms of trimethylsilanol was determined in an activated sludge respiration inhibition test. The 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 CSR.

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