The name “black tungsten wire” primarily derives from its dark black surface appearance, which is closely related to its production process.
During the production of black tungsten wire, particularly in the wire-drawing process, graphite milk is applied as a lubricant to reduce friction and protect the surface of the tungsten wire. This graphite milk adheres to the wire’s surface during high-temperature drawing, forming a dark black coating.
In contrast, “cleaned tungsten wire” refers to tungsten wire that has undergone electrolytic polishing or chemical cleaning, where the graphite milk and other impurities are removed, resulting in a shiny, silver-white surface.
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