Graphite Round Stick for Gold Silver Casting There are two types of graphite rod, blank material (unmachined graphite rod) and finished product (machined graphite rod). Graphite rods are often used as electric heating elements in high-temperature vacuum furnaces. The maximum operating temperature can reach 3000�?�°C. It is easy to oxidize at high temperatures, it can only be used in neutral or reducing atmospheres and vacuum furnace. Its thermal expansion coefficient is small, thermal conductivity is large, resistivity is (8~13) 10-6 m, easier to process than SiC, MoSi2 rod, high temperature resistance, extreme cold and extreme heat resistance, good price Cheaper.