Composition of brick

Alumina:

A good class brick consists of 20-30% of Alumina. Excess of Alumina in clay makes the brick crack and wrap on drying.

Silica:

In general, bricks are made with 50-60% of Silica in it. Excess of Silica in brick makes the brick to brittle.

Lime:

Brick consists of 0.8-2% of Lime in it. Excess of lime in brick may cause to melt and distort during burning.

Other constituents:

Magnesia, Sodium, potassium, manganese and iron oxide.

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