Grade Application Length and width, not more than Thickness, mm Electrical strength, kW/mm, not more than Specific surface resistance Ohm, not less than SOV – mica for optical and vacuum devices used in optical, vacuum and radio engineering devices 90 0,015 - 0,04 40 1*10*8 SP – mica for radio engineering 90 0,015; 0,016; 0,025 40 1*10*8 SMGP – muscovite mica for generator devices 90 0,015 - 0,04   1*10*8

Square-shaped mica plates, square equal up to 150cm2.