NOVELTY - Composition (I) comprises mica and glass, where the glass comprises silicon dioxide (SiO2) (10-30 mole%), barium oxide (BaO) (5-40 mole%), boron trioxide (B2O3) (15-30 mole%), and zinc oxide, alkali oxide and alkaline-earth oxide at 15-65 mole%.    USE - (I) is useful for obtaining a composite material, which is useful in electrical insulator. The insulator is useful as brake rheostat support, high voltage cable insulation, power resistor support, insulator and support for electric motor, connecting terminal of electric motor, cage insulation receiving the brushes of an electric motor, control for shutting off the electrical pole, support for electrical power cable, shim or insulating support for high frequency application, insulation rail for industrial current collection, heating element support or termination, support or insulation device for electrical current collection of third rail for electric vehicle, insulation for power rectifier, insulation for high power switch, terminal connection of transformer, wall penetration for transmission of electric current, support or insulation of pantograph system, gas lighters, oxygen sensors, pressure and/or temperature sensor, electric port filament, laboratory plate equipment, equipment for electron gun, heat and/or electric systems in car, aircraft defrosting system, corona discharge systems, high temperature lamp systems, support for fuel cells, and glass contact tip (all claimed).    ADVANTAGE - (I) has good mechanical and electrical properties. (I) is resistant to heat, shock and vibration.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) obtaining a composite material comprising mica particles and glass matrix, comprising heat treatment of (I) in powder state, where the heat treatment occurs at a temperature such that the viscosity of the glass is 1.102-1.103 dPa.s;    (2) a material obtained by the process;    (3) an electrical insulator comprising the material; and    (4) glass comprising SiO2, BaO, B2O3, and bismuth oxide (Bi2O3) (0.5-15 mol.%).    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of an insulator.    Holes (1, 2)    External surface (3)    Height (4)    Closest points. (5, 6)