1. Several umbrella-shaped insulator rips can prevent surface flashover. 2. The insulator body made of 95% alumina porcelain has the quality of anti-thermal shock, good mechanical electrical performance and insulation reliability. 3. The shell plated with nickel is anti-oxidation, anti-corrosion; it is riveted on the edges via electric heating to guarantee the reliable seal performance. 4. The insulator is inside sealed by using conductor glass sealant, achieving excellent conducting and sealing performance. 5. Layered sealing gasket is adopted with good elasticity, high strength, non-shedding and reliable sealing. 6. Nickel-copper compound (copper) electrode is used as the center electrode with good thermal conduction and electricity conductivity, high-temperature resistance, anti-oxidation, corrosion resistance and long service life.