Kiln Bricks, also referred to as Fire Bricks or Refractory Bricks, are made from ceramic refractory material that can withstand extremely high temperatures, such as those achieved in kiln firings. The bricks typically line the inside of a kiln (furnace, fireplace, etc.) and serve as great insulators, making heat loss minimal and energy use efficient. Kiln bricks are available in different shapes and sizes, and come in either soft or hard material.
Kiln bricks come in two forms: hard brick and soft brick. So, what is the difference? Hard bricks are typically very strong and dense and used most commonly as structural support in kilns. These bricks are able to withstand extreme temperatures and various atmospheric conditions. Soft bricks are less dense than hard bricks and are excellent insulators. These are typically found in electric kilns or any kiln or furnace that requires insulation.
Bricks are available in a variety of shapes, though a standard brick is rectangular and measures 9” x 4.5” x 2.5”. Rectangular bricks measuring 9” x 4.5” x 3” are becoming increasingly popular, since the 3” firebrick provides added insulation and increases energy efficiency.