Brick that has been treated in a kiln at an elevated temperature to harden it, give it mechanical strength, and improve its resistance to moisture.

Why are the bricks heated in a kiln?

In a continuous kiln fire is always burning and bricks are being warmed, fired and cooled simultaneously in different parts of the kiln. ... Heat in the flue gas is utilised for heating and drying of green bricks and the heat in the fired bricks is used for preheating air for combustion.

What are burnt bricks made of?

Fired bricks are burned in a kiln which makes them durable. Modern, fired, clay bricks are formed in one of three processes – soft mud, dry press, or extruded. Depending on the country, either the extruded or soft mud method is the most common, since they are the most economical.