Percentage of various ingredient in a good brick earth with their function is as follow:
|S. no.||Raw Material||Function|
|1.||Silica (50-60) %||Imparts strength, hardness and uniform shape and size.|
|2.||Alumina (20-30) %||Imparts plasticity to brick.|
|3.||Lime (<5%)||Help in fusion of materials and binding particles together.|
|4.||Iron oxide (5-6%)||Imparts red color and improves impermeability and durability.|
|5.||Magnesia (<1%)||Imparts yellow tint to bricks and decrease shrinkage.|
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