FIELD: treatment of wood materials in construction engineering; applicable in wood impregnation as antiseptic and bio-fire-proofing agents. SUBSTANCE: method includes preparation of water-soluble preparation containing diammonium phosphate, carbamide and sodium fluoride. Introduced additionally into preparation is aqueous solution of acetonoformaldehyde resin. EFFECT: higher antiseptic and fireproofing properties due to definite ratio of composition components. 2 tbl
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