Bricks are burned at high temperature to gain the strength, durability, density and red colour appearance. All the water is removed at the temperature of 650°C but they are burnt at a temperature of about 1100°C because the fusing of sand and lime takes place at this temperature and chemical bonding takes between these materials after the temperature is cooled down resulting in the hard and dense mass.Bricks are not burnt above this temperature because it will result in the melting of the bricks and will result in a distorted shape and a very hard mass when cooled which will not be workable while brickwork.