In Swedish, tungsten means a "heavy stone". Specific gravity of tungsten is 19.3, which is nearly the same as gravity of gold. Melting point of tungsten is 3,380°C, the highest point in all metal. Tungsten is used as filaments of electronic bulb and magnetrons of electronic range by utilizing one of the tungsten's properties, resistance to heat. Moreover, it is used as corona discharge wires for coping machines and air cleaners by taking advantage of one of the properties, hard and strong.
Nippon Tungsten produces tungsten wires, tungsten rods, and tungsten discs (TD) for automobile contacts like horns, etc. Especially, one of the tungsten wire products, B701 for halogen lamp filaments, is highly evaluated by the world users.