FIELD: manufacture of building materials. SUBSTANCE: long- length fibrous polyacrylonitrile-based material is subjected to electrochemical oxidation in two or more steps successively from different sides. Electric resistance in each step is increased in direction from middle part of material to edges by 2-10%. Summary effective quantity of electricity applied onto each side of material after completing all steps of treatment is the same and equals 30-600 Coulomb/g. Electrochemical oxidation lasts 0.2-4 min. Thereafter, material is washed, dried, and thermally treated at 550-850 C in inert medium. Finally material is additionally kept in air at 25-200 C for 0.2-30 min. EFFECT: achieved properties required for construction materials. 1 tbl
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