Information About Firebricks

Firebricks are bricks that are featured with high refractoriness. They are widely used in different kinds of high thermal parts and high temperature furnaces and kilns.

Based on the shapes, they are classified into shaped and unshaped refractory materials.

Shapes

Most bricks are pressed or extruded. Common shapes are straights, arches, wedges, keys, rotary kiln blocks (RKBs) and square-edge tiles. Larger pieces are typically produced by air hammering the brick mix into wooden or steel molds sized for the desired shape dimensions.

The standard refractory brick size is 9×4½×2½ inches, also known as one brick equivalent (beq). This size is the most common used in pottery kiln construction. However, an equally popular standard size used in industrial furnace construction is the 9×4½×3-inch series. The 3-inch series brick reduces the number of joints in the kiln.

Straights—the standard straight is 9×4½×2½ inches or 9×4½×3 inches and available in larger sizes up to 18 inches long, 9 inches wide, and 4½ inches thick.

Square edge tile—This term refers to “big” straights, which comprise 12×12 inches up to 24×12 inches with thickness ranging from 1½ to 3 inches.

Soaps—A term used to describe a half brick in width such as 9×2¼×2½ inches or 9×2¼×3 inches.

Splits—A term used to describe a the thickness of a brick thinner than 2½ inches, i.e., splits come in 1, 1¼, 1½, and 2 inch thicknesses.

Arch—This shape tapers in thickness along the width over its entire length and is used to make sprung or circular barrel arched roofs either 4½ inches or 6 inches in thickness.

Wedge—This shape tapers in thickness along the entire length of the brick and is used to make sprung or circular barrel arches 9, 12 or 13 inches in thickness.

Skew—A shape having a certain taper on one side or end to enable a sprung arch to be built. Four major types are available in both side and end skews that relate to the rise of the arch.

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