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A study to investigate the hydrolysis as a function of pH for 2,2'-dimethyl-2,2'-azodipropiononitrile was conducted according to OECD Guideline 111 at temperatures of 60±1°C, 70±1°C and 80±1°C and extrapolated to 25°C. The results were as follows: Rate constant 1.08x 10-4 and half life of 263 days at pH 4; Rate constant 9.50x10-5 and half life of 304 days at pH 7 and Rate constant 1.38x10-4 and half life of 210 days at pH 9. On this basis azobis(cyanoisopropyl) can be considered as a stable substance not subject to hydrolysis.