In order to produce dumet wire, some key processes must be precisely controlled. In the set-up line, the cladding is realized: a Copper clad on a core wire (e.g. Nickel-Iron). This Copper cladded wire is welded to achieve an endless length and drawn to obtain the requested diameter. Finally the surface of the dumet has to be treated to guarantee a good adhesion to the glass. Depending on the application requirements this well-defined surface treatment can be done in either ways: Borating, oxidizing or nickel-plating.
It is available in various surface finishes: electrically oxidized, borax coated. Borated surface finish Dumet is used in Lead-in-wires for lamps. Dumet forms a glass-to-metal seal while manufacturing these lamps.