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Environmental fate & pathways

Phototransformation in air

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Description of key information

The QSAR calculated rate constant for the OH sensitized photodegradation of isophorone diisocyanate cyclotrimer is approximately 4.02E-11 cm3/(molecule * s). At 500,000 OH radicals / cm3 (approximate 24-hour mean in central Europe), this corresponds to a half-life of 9.6 hours. Higher oligomers have more reactive functions and therefore a lower half-life will be calculated.

Key value for chemical safety assessment

Half-life in air:
9.6 h
Degradation rate constant with OH radicals:
0 cm³ molecule-1 s-1

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