Tungsten is the most widely used refractory metal. It is essential for the production of lighting products such as wire filament, and other goods where its high temperature properties are of use in wire form. The properties the tungsten wire have are a melting point of 3410° C, a low coefficient of thermal expansion and low vapor pressure at elevated temperatures, along with good electrical and thermal conductivity.
The important applications of tungsten wire are for the production of coiled incandescent lamp filaments, cathode and support structures for power tubes, heating elements for high temperature furnaces and evaporation sources in metalizing processes. Thicker wire sizes, straightened, finish-ground and cut into rod pieces which are widely used for glass-to-metal seal lead parts in the lighting and electronic industries.