Therelek’s chamber furnace can operate up to 1800°C. These furnaces are usually rugged, refractory based construction or lightweight ceramic fiber board and insulation based in construction. Heating elements could be Ferrous-Alumel-Chromel alloys, nichrome, silicon carbide or molybdenum disilicide depending on the temperature and process; and could be in the form of single or bundled wires, rods, wound coils, strips.