More than 2000 years ago, the Celtics used graphite to produce fireproof bricks. In today's heavy industry world, graphite still plays an important role in this application because of its high oxidation resistance, excellent thermal conductivity and chemical inertness. As a highly heat-resistant thermal conductivity additive, graphite is an important part of many refractory materials used in metal production industries such as steel manufacturing. In these harsh environments, it can be found in magnesite bricks used in furnace linings, continuous casting drains, or mold compounds.