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The QSAR calculated rate constant for the OH sensitized photodegradation of isophorone diamine is approximately 8.47E-11 cm3/(molecule * s). At 500,000 OH radicals / cm3 (approximate 24-hour mean in central), this corresponds to a half-life of 4.5 hours. The hydrolysis of isophorone diamine as a function of pH was studied according to OECD TG 111. At pH 4,7 and 9, less than 10% of the test substance were observed to hydrolyse at 50 °C within a period of 5 days, demonstrating hydrolytical stability in the environment.