NGK has been supplying various kind of hollow insulators for apparatus, such as Power Transformer, Gas Circuit Breaker, Current & Voltage Transformer and so on, up to 1000kV. These insulators are designed in accordance with customer's requireme

- NGK has developed a shed profile having longer leakage distance to improve contamination in the 1980s and has established an ultralarge 12-meter hollow insulator that will be used in 1000kV power transmission systems.