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Potassium chlorate, which is used mainly in the manufacture of matches, was prepared by the electrolytic oxidation of potassium chloride in an 800A cell using graphite substrate lead dioxide anode and stainless steel cathode. The cell was operated at an anode current density of 5 A/dm', a temperature of 55 to 60 "C and a pH of 6.0 to 7.0. A current efficiency of 82 to 85 % was obtained and an assay yield of 77 % was realised for the recrystallised product. The cell voltage was 3.2 to 3.3 V with an energy consumption of 6.3 to 6.5 kWh (d.c.)/kg of potassium chlorate produced.The cell effluent, being clear and free from suspended impurities, could be processed further without filtration and pure potassium chlorate (> 99%) was obtained by recrystallisation.