“…Organic insulating materials: shellac, resin, rubber, cotton yarn, paper, hemp, rayon, mostly Jue Yuan Qi, winding wires used to manufacture of coating insulation content to wait. Mixed insulating material for above two kinds of material made by processing various molding insulating materials used as the base, hull, electric [7][8][9][10][11].Insulation material and macro properties such as electrical properties, thermal, mechanical properties, resistance to chemicals, resistant to climate change, corrosion resistance performance and its chemical composition, molecular structure has close relationship. Inorganic solid insulation material is mainly composed of silicon, boron and many kinds of metal oxide mainly composed by ionic structure, main characteristic for heat-resistance, high, average temperature more than 180 ℃ work, good stability and resistance to atmospheric aging sexual anticorrosion chemical resistance and long-term under the action of the electric field good aging properties; But brittle high, impact resistance of low intensity, high voltage and low tensile strength.…”