21-09-2017, 11:40 AM
A fire brick or refractory brick or refractory brick is a block of refractory ceramic material used in lining furnaces, ovens, stoves and fireplaces. A refractory brick is mainly built to withstand high temperatures, but it also tends to have a low thermal conductivity for greater energy efficiency. High density bricks are generally used in applications with extreme mechanical, chemical or thermal loads, such as the interior of a wood-fired oven or an oven, which is subjected to abrasion of wood, ash or slag flux and high temperatures. In other less harsh situations, such as in an electric gas or natural gas furnace, more porous bricks, commonly known as "oven bricks", are a better choice. They are weaker, but they are much lighter, easier to form and insulate much better than dense bricks. In any case, refractory bricks should not be sprayed, and their strength should be maintained well during rapid temperature changes.