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The hydrolysis study of Diphenyl sulphone was conducted according to the standard OECD guideline 111. The preliminary test for hydrolysis of Diphenyl sulphone was conducted at 50 ± 0.5°C in the dark at pH 4, 7 and 9 buffer solutions for a period of 5 days. Based on the preliminary test data generated in this study, Diphenyl sulphone was found hydrolytically stable in pH 4, 7 and 9 buffers at 50 ± 0.5°C, with less than 10% degradation at each pH. These results clearly indicate that the compound Diphenyl sulphone was stable over a period of 5 days at 50 ± 5°C which would indicate a DT50 of >1 year at 25°C. So according to the instructions of the test guideline, an additional test did not have to be conducted.