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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

A static acute 96-hour fish toxicity limit test according to Directive 92/69/EEC was performed with Danio rerio (Bayer AG, 2000). No mortalities or abnormal swimming were observed. The analytical test concentration, which was determined daily by DOC measurements, was 72.3 mg/l. In a semi-static acute fish toxicity test according to Directive 92/69/EEC, Hüls AG (1996) no mortalities in Cyprinus carpio within 96 hours of exposure to concentrations up to the maximum possible concentration of 208 mg/l were observed.

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Additional information

The LC50 values for Danio rerio and Cyprinus carpio were determined as >72 mg/L and >208 mg/L, respectively. In view of the low solubility in water (see chapter 4.9) and the liability towards hydrolysis (see chapter 5.1.2) of 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, exposure to well-defined aquatic concentrations is difficult to achieve. Due to fast hydrolysis, the observed effect is expected to be the effect of the hydrolysis product. In the aquatic environment, only the chemically less reactive hydrolysis product is expected to be relevant. The methods used for the determination of the test substance concentration (DOC or TOC) do not differentiate between parent substance and hydrolysis product. Hence the analytical results should be treated with caution.