The substation insulator caps for ultra-high voltage transmission circuitry rank the top in the industry concerning capacity, quality and variety, which contributes to acquirement of the provincial excellent product in 1984, the ministry of machinery excellent product in 1985, the International Adoption Certificate in 1993 and the first-class product of the ministry of machinery in 1994. The products are mainly covered Chinese market and dozens of foreign countries and regions, such as America, Japan, Germany,France, UK, Turkey, Italy, Sweden, India, South Africa, Russia, Poland, Egypt, Thailand, South Korea and Finland.