FIELD: chemistry of organophosphorus compounds. SUBSTANCE: method involves esterification of phosphorus-containing compounds with a mixture of synthetic 3,5- and/or 3,4-xylenol and phenol in the presence of catalyst and the indicated mixture has the following ratio of components, wt.-%: 3,5- and/or 3,4-xylenol 80-85, and phenol 15-20. Obtained product is used for preparing hydraulic and lubricating fireproof liquids. EFFECT: improved method, enhanced quality of product. 2 tbl
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