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The photodegradation of cumene hydroperoxide in air by reaction with OH radicals was calculated using EPIWIN v3.20, AOPWIN v1.92. Based on the reaction rate constant k(OH)=8.63 x 10E-12 cm³/molecule x sec (25°C) and assuming a OH radical concentration of 5 x 10E5 radicals/cm³ (24 h d) a half-life t1/2=44.6 h was calculated.

The hydrolysis as a function of pH of 1-methyl 1-phenylethyl hydroperoxidewas assessed according to the OECD guideline 111. According to the results of this study,1-methyl 1-phenylethyl hydroperoxidecan be considered as stable at pH 4, 7 and 9.

At pH 1.2, the test item is hydrolytically unstable. The half-lives were respectively 14.1, 53.3, 311(estimation) and 1386 hours for the temperatures 50, 37, 25 and 15°C.