Fire clay

Fire clay in a furnace

Fire clay is a range of refractory clays used in the manufacture of ceramics, especially fire brick. The United States Environmental Protection Agency defines fire clay very generally as a "mineral aggregate composed of hydrous silicates of aluminium (Al2O3·2SiO2·2H2O) with or without free silica."[1]

  1. ^ "Calciners and Dryers in Mineral Industries" (Background Information for Proposed Standards). U.S. Environmental Protection Agency. 1985. pp. 3–48. EPA-450/3-85-025a.