... etching.Tungsten wire is spooled on clean, defect free spools. For very large diameters, Tungsten wire is self coiled. Spools ... Tungsten wire Used in making filaments in incandescent bulb, fluorescent lamp, heating filaments, spring filaments, grid electrode, gas-discharge ... be removed before using. The Tungsten wire is not suitable for contacting with iron, nickel, carbon, when the temperature is ...