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Ecotoxicological information

Long-term toxicity to fish

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Link to relevant study record(s)

Description of key information

A read-across is carried out from MBT to CBS, as the primary metabolite of CBS. The Maximum Acceptable Toxicant Concentration (MATC) in an early-life stage test on rainbow trout was determined to be 0.041 - 0.078 mg/l within 89 days for MBT. The concentration of 0.078 mg/l was reported as LOEC and 0.041 mg/l as NOEC (Chemical Manufactures Association Rubber Additives Panel, 1989).

Key value for chemical safety assessment

Additional information

There is no direct data available regarding the chronic effect of CBS on fish. As the primary metabolite from CBS, MBT has a long-term study available for fish and hence a read-across approach is used to support the toxicity discussion regarding CBS. However the effective concentration reported in this study is higher than the one reported for the long-term effect on Daphnia, and hence this value is not used in risk assessment for the PNEC estimation.