Methods of Manufacture
Modern clay bricks are formed in one of three processes – soft mud, dry press, or extruded.
Normally, brick contains the following ingredients:
- Silica (sand) – 50% to 60% by weight
- Alumina (clay) – 20% to 30% by weight
- Lime – 2 to 5% by weight
- Iron oxide – ≤ 7% by weight
- Magnesia – less than 1% by weight
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