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EC number: 206-341-3
CAS number: 329-01-1
The acute toxicity of a,a,a-trifluoro-3-tolyl isocyanate was characterized by an EC50 of 4.2 mg/L by using a solvent. The hydrolysis product a,a,a-trifluoro-3-trifluoro-m-toluidine shows an EC50 of ca. 35 mg/L.
Isocyanates are known to rapidly hydrolyse under the formation of the
corresponding amine as well as solid polyurea compounds *. However, the
insoluble inert polyurea is not assumed to cause environmental hazards
due to the reduced uptake of high molecular mass compounds, whereas the
amine is assumed to be the ecotoxicological relevant species.
Concluding, tests performed using the corresponding amine can equally be
used to assess the ecotoxicological hazards of isocyanates assuming the
complete transfer of the isocyanate into the corresponding amine while
neglecting the formation of a certain fraction ecotoxicological not
active polyurea compounds. An underestimation of environmental hazards
is thus avoided supporting a conservative and thus protective hazard
* Bayer Industry Services (2004). 4-chlorophenyl-isocyanate:
Investigation on Stability in Aqueous Test Solutions. Project No:
200300181. Leverkusen, Germany.
Bayer Industry Services (2003). Isopropylisocyante: Investigation on
Stability in Aqueous Test Solutions. Project No: 200300095. Leverkusen,
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