ИСТИНА

FIELD: carbon-graphite materials production. SUBSTANCE: flexible graphitic foil has thickness - 0.100 mm and more, density - 0.5 - 1,4 g/cm3 and is made of pressed and expanded in direction of crystallographic axis "c" of graphitic particles with form factor 3 - 5 and with size of crystallites along "c" axis, that does not exceed 250 . Method provides for chemical treatment of natural graphite powder by solution of sulfuric acid with oxidizer of oxidizing-reducing potential of solution - 1.10 - 1.80 V (gas-shaped ozone, chlorine, sulfur oxide (6+) or ammonium persulfate are used as oxidizer) hydrolysis, washing, drying and thermal treatment of oxidized graphite under temperature of no less than 700 C in chamber of heating during its spraying in stream of heated gas-carrier with following feeding of the stream in chamber of vacuum space with diameter, exceeding diameter of heating chamber 10 - 20 times as much, following rolling of expanded particles graphite layer, carried out under specific pressure - 0.5 - 3.0 MPa, with interim roasting and second rolling, carried out under specific pressure - 5.0 - 20.0 MPa. EFFECT: flexible graphite foil and method of its production is used in chemical industry, metallurgy and other industries. 4 cl, 1 dwg, 2 tbl