FIELD: inorganic compounds production. SUBSTANCE: sodium percarbonate particles are coated in aqueous solution with coating containing 10 to 90 wt % of boric acid and neutral alkali metal or ammonium salt, e.g. halide, sulfate, nitrate. Coating is applied either by spray technique or by multiple passages through mixer or drier at 10 to 60 C. During coating procedure, percarbonate is agitated in mixer. Concentration of coating reagent in aqueous solution is at least 15%. Neutral salt can additionally contain sodium or potassium chloride or sulfate. Coating is dried in fluidized bed at 50 to 90 C. Weight of coating constitutes 0.5 to 20% of summary percarbonate and coating weight. EFFECT: significantly increased stability of percarbonate. 18 cl, 9 tbl, 25 ex
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