NOVELTY - Composition comprises mica and glass, where the glass comprises: silicon dioxide (10-30 mol.%); barium oxide (5-40 mol.%); and boron oxide (15-30 mol.%), where the total level of zinc oxide, alkaline oxide and alkaline-earth oxide is 15-65 mol.%.    USE - The composition is useful for the preparation of composite material, which is useful in electrical insulator, where the insulator is useful as: support braking rheostats; insulation of high voltage cable; support of power resistor; insulator and support for electric motor; terminal connection of electric motor; cage insulation for receiving the brushes from an electric motor; control for tripping of electrical pole; support of power cable; wedges or insulating support for high frequency application; insulation for industrial power collection rail; support or connection of heating element; support or insulation device for electrical current collection of third rail for electrical vehicle; insulation for power rectifier assembly; high power insulation switch; connecting terminal of the transformer; wall penetration for electric current transmission; support or insulation of pantograph system; gas lighters; oxygen sensors; pressure sensor and/or temperature; electrical door-filament; laboratory plate equipment; equipment for electron gun; thermal and/or electric systems in cars; aircraft de-icing system; corona discharge systems; high temperature lamp systems; support for fuel cells; and glass contact tip (all claimed).    ADVANTAGE - The composition: has improved electrical property such as dielectrical property, good mechanical property in wet aging and molding property, good resistivity in water, and good thermal property even after immersion in 3 days in deionized water; and is free of heavy metals.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a process for obtaining a composite material comprising mica particles and glass matrix, comprising heat treatment of the composition in powder state, the heat treatment occurring at a temperature such that the viscosity of the glass is 1x 102-1x 103 dPa.s;    (2) a material obtained by the process;    (3) an electrical insulator comprising the material; and    (4) the glass comprising silicon dioxide, barium oxide, boron oxide and 0.5-15 mol.% of bismuth oxide.