... Tungsten coil 2.tungsten heater 3.tungsten spiral 4.vacuum metallizing wire,VM wire 5.tungsten wire Tungsten is an ... excellent material for evapotation sources.Tungsten coil ( vacuum metallizing coil, VM coil, tungsten heater, tungsten filament, tungsten spiral ... resistance, and long life.They are mainly used for vacuum metallizing, such heating elements for chrome scope, mirrors,plastic and ...