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Firebrick is a type of refractory brick that is designed to withstand high temperatures and resist the effects of heat and fire. It is commonly used in applications where there is a need for insulation and protection against extreme heat, such as in furnaces, kilns, fireplaces, and industrial ovens. Firebricks are made from a combination of clay and other refractory materials, which are then fired at high temperatures to create a dense and durable brick. The clay used in firebrick production is usually high in alumina content, which gives the brick its heat-resistant properties. One of the key features of firebricks is their ability to retain their strength and shape even at elevated temperatures. This makes them ideal for lining the walls and floors of high-temperature environments, as they can withstand the thermal expansion and contraction that occurs during heating and cooling cycles.