Graphite Carbon Brick Description Carbon bricks are a type of carbon refractory material made from coke, anthracite or graphite and tar as raw materials, mixed and formed, and fired in a reducing flame to 1450 ℃. The mass fraction of carbon is 88% to 90%. Capable of withstanding the erosion of molten metal and various slag. Used for laying the bottom and belly of blast furnaces Carbon bricks have good thermal stability, low coefficient of thermal expansion, high temperature resistance, and resistance to various acids, alkalis, salts, and organic solvents.