Normally a firebrick it is only a small piece of refractory ceramic material. Usually it is used in the furnace of lining, oven of burning, In the chamber of a boiler in which the fuel is burned and in fireplaces. The main purpose of this type of brick is that can resist high temperatures and as the same time a thermal conductivity in a very low proportion. During the rapid changes of temperature the brick should not be broken when they are been used.
They are used in an electric kiln, gas kiln, etc. The fire bricks can be with lot or less pores, with different variety of density, depending in which application is going to be used.
There are with different shapes: triangle, rectangle, form of long blocks, circle, and square.
Colors: Light brown, dark brown, ivory, white, black, dark red, light red, orange, yellow.
Some they have light weight and some are very heavy depending for which application is going to be used. Some are resistant to chemicals, others are resistant to acids, others are resistant to the heat etc. Some have big pores others have small pores. These fire bricks are been used in the factories, for the manufacturing of steel, iron, aluminum, cooper, cement, gas, petrol, plastics, chemicals, electric power energy. In their composition they have aluminum oxide in different quantity. In a lining for furnaces it is used the fire bricks of the group called Magnesium oxide. And in the inner lining of furnaces and incinerators are used the fire bricks called Silica.