FIELD: chemical industry. SUBSTANCE: method comprises mixing solid barium hydroxide and boric acid in stoichiometric ratio. Solid barium hydroxide is first charged into mixer, heated to temperature of 35-70 C and stirred at above- mentioned temperature for at least 5 minutes, boric acid is then added, and stirring is continued for at least 55 minutes. EFFECT: simple method and lower manufacturing price of the product. 3 cl, 1 tbl
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