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From Wikipedia:

Some basic information about firebrick.


"A fire brick, firebrick, fireclay brick or refractory brick is a block of ceramic material used in lining

furnaces, fireboxes and fireplaces.

A refractory firebrick is built primarily to withstand high temperature; but will also have a low thermal

conductivity for greater energy efficiency, usually dense firebricks are used in applications with Extreme

Mechanical, Chemical or Thermal Stresses, such as the inside of a wood fired kiln or a furnace, which is

subject to abrasion from wood, fluxing from ash or slag and high temperatures.

In other, less harsh situations such as an electric or natural gas fired kiln more porous bricks, commonly

known as "kiln bricks", are a better choice. They are weaker but much lighter and easier to form and

insulate far better than dense bricks.

In any case firebricks should not spall, and thier strength should hold up well during rapid temperature

changes"'.