Anthracite is one of the hardest forms of coal and is known for its high carbon content. Aside from as a fuel, anthracite finds use in high temperature applications - especially when calcined - due to its relatively high resistance to thermal shock, strength and chemical inertness.
Sand casting is an efficient and economical process of producing geometrically complex components and shapes using non-reusable molds. However certain defects can occur in the process.
Although, Petrobond and clay dust sands share several properties in common, coal dust according to a recent study has been shown to possess some characteristics that gives it an upper hand in a casting process.