Fireclay bricks are a type of refractory brick made from fireclay, a special clay that can withstand high temperatures. They are commonly used in applications like kilns, furnaces, and fireplaces due to their excellent thermal resistance and durability. These bricks can endure temperatures exceeding 1,500 degrees Celsius (2,732 degrees Fahrenheit) without breaking down. The manufacturing process involves shaping the clay and then firing it in a kiln to enhance its strength and heat resistance. Fireclay bricks are known for their low thermal conductivity, which helps to retain heat, making them ideal for energy-efficient heating systems.