A brick made to withstand high temperatures, costing more the higher the temperature, from $1.50 to $20 a brick. Usually very hard and heavy, a poor insulator. Available in many shapes. Used for furnaces mostly. See also Fire brick, Insulating. From A.P.Green, Mexico MO and local offices, National Refractory, see Refractory in Yellow Pages..

A fire resistant brick used to line a fireplace.

Heat resistant refractory ceramic material formed into bricks and used to line fire boxes of boilers, furnaces, or other combustion chambers.