FIELD: lining walls of shielded premises. SUBSTANCE: ferrite material has in its composition nickel, zinc, cobalt, and ferric oxides, their proportion being as follows, mas.%: NiO, 8.5-10; ZnO, 21-25; CoO, 0.5-1; ferric oxide, the balance. Ferric material, when stuck to metal, provides for absorption of electromagnetic field with coefficient higher than 10 dB in frequency range between 30 and 1200 MHz. EFFECT: reduced secondary reflection of electromagnetic waves inside shielded premises undesirable in particular at resonant frequencies of mentioned premises.
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