This Coil is made from lead wires and a Nikrothal wire in the center. Nikrothal is an austenitic nickel-chromium alloy for use at temperatures up to 1200°C. The alloy is characterized by high resistivity, good oxidation resistance and very good form stability. Nikrothal has good ductility after use and excellent weldability. Nikrothal wire has superior life compared to competitive NiCr alloys because of the extremely good adhesion properties of the surface oxide. It also has the advantage of having good mechanical properties in the hot state.