NGK Corp, formerly NGK Insulators Ltd, is a Japan-based company mainly engaged in the environment, digital society, and energy & industry business. It operates through three business segments. The Environment Business segment manufactures and sells automotive exhaust gas purification components, sensors and general industrial ceramic products and equipment, corrosion-resistant equipment for the chemical industry, membrane separation equipment for liquids and gases, combustion equipment and refractories, and low-level radioactive waste treatment equipment. The Digital Society Business segment manufactures and sells products for semiconductor manufacturing equipment, electronics industry products, beryllium copper products, and mold products. The Energy & Industry Business segment manufactures and sells power insulators and equipment, sells electricity utilizing sodium sulfur (NAS) batteries and others. Other businesses include insurance agency services and golf course management.