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There is no test on hydrolysis for 3,4-dichlorophenyl isocyanate available. Based on the reaction of isocyantes in water, results from the hydrolysis study of the structural analogue 4 -chlorophenyl isocyanate are used to describe the hydrolysis properties of  3,4 -dichlorophenyl isocyanate.
A test was performed in order to examine the stability under conditions simulating those in the environment (pH 7, presence of light and air). The results show that 4-chlorophenyl isocyanate hydrolyses rapidly, forming CO2 and 4-chloroaniline as primary hydrolysis products. Assuming a kinetic function of first order, a half life period of 7.3 h can be calculated (Bayer Industry services, 2004).

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