Firebrick, also known as refractory brick or heat-resistant brick, is a type of specialized brick designed to withstand high temperatures without breaking down or losing its structural integrity. Firebricks are made from refractory ceramic materials that are capable of withstanding temperatures well above those experienced by regular construction bricks. They are often used in applications that involve intense heat, such as fireplaces, kilns, furnaces, and industrial boilers. Firebricks are known for their excellent thermal insulation properties, which help to prevent heat loss and maintain high temperatures within the enclosed area. Their composition and dense structure allow them to resist thermal shocks, chemical erosion, and mechanical stress caused by repeated heating and cooling cycles. Firebricks are a vital component in creating durable and efficient heat-containment systems, ensuring safety and longevity in high-temperature environments.

Firebricks are typically made by combining refractory materials such as clay, alumina, silica, and other additives. The materials are mixed and shaped into brick forms, either by hand molding or through a mechanical extrusion process. The formed bricks are then dried and fired in kilns at high temperatures to enhance their strength and thermal properties. The firing process causes the materials to undergo chemical and physical changes, resulting in a dense, heat-resistant structure. The exact composition and manufacturing process may vary depending on the specific requirements of the firebrick and its intended application.