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FIELD: chemical technology. SUBSTANCE: method involves suspending of graphite in concentrated sulfuric acid, addition of oxidizer ( oxygen-ozone mixture containing 3-10 vol. % ozone ), separation of solid fraction from liquid, its washing, drying and thermal working of oxidized graphite obtained at 1000 C for 3 s. Specific gravity of expanded graphite obtained is 0,001-0,002 g/cm3, expansion degree is 350-700. EFFECT: improved method and enhanced quality of graphite. 2 cl, 1 tbl