||Also known as columbium, niobium has good resistance to chemical corrosion and has been used in applications where the extreme inertness of tantalum is not required and economy is important. Niobium is commonly alloyed with tungsten and tantalum to produce metals with excellent mechanical properties at high temperatures. When alloyed with titanium, niobium becomes useful in applications in the field of superconductors. As a result of its 2468°C melting point, niobium is classified as a refractory metal.
||The platinum group of metals have many diverse uses in both high technology and commercial products. Some applications include electrical contacts, catalysts, glass sealing, thermocouple and resistance thermometer elements, electrodes, furnace windings, dental alloys, as well as water purification and food processing equipment. Platinum is classified as a precious metal.
||Used in a variety of lamp, electronic tube and electronic furnace applications, tungsten wire is supplied in a cleaned and straightened non-sagging condition or alloyed with thoria or rhenium. Pure tungsten's melting point is 3410°C which is the highest of all metallic elements. Tungsten's extremely high tensile properties make it attractive for a variety of high temperature mechanical applications. Tungsten is classified as a refractory metal.