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Environmental fate & pathways


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Description of key information

In a screening test at 50 °C the HDI Trimer was found to hydrolyse by 84 – 89 % within less than 1 hour at pH values of 4, 7, and 9.
Approximate mean half lives of 3 hours were estimated at any pH and environmental relevant temperatures. A hydroysis product based on the hydrolysis of the 3 Isocyanate groups to the corresponding amine functions has been proposed.
Regarding disappearance of Isocyanate groups, the half-life (DT50) of HDI Trimer in an acetonitrile/water solution is approx. 7.7 hours at room temperature (23 °C).

Key value for chemical safety assessment

Half-life for hydrolysis:
3 h
at the temperature of:
20 °C

Additional information