Qualities of Good Bricks

The good bricks which are used for the construction of important structures should posses the following qualities:

  1. The bricks should be table-moulded. well burnt in kilns, Copper-coloured, free from cracks and with sharp and square edged. The colour should be uniform and bright.
  2. The brick should be uniform in shape and should be of standard size.

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    Standard size of bricks
  3. The brick should give clear metallic ringing sound when struck with each other.

    Image result for striking of two bricks with each other
    Striking of bricks with each other
  4. the bricks when broken or fractured should show a bright homogeneous and uniform compact structure free from voids.
  5. The brick should not absorb water more than 20% by weight for first class bricks and 22% by weight for second class bricks, when soaked in cold water for a period of 24 hours.

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    Bricks soaked in water
  6. No brick should have crushing strength below than 5.50 N/mm²
  7. The brick when soaked in water for 24 hours, should not show deposits of white salts when allowed to dry in shade.
  8. It should not break into pieces when dropped flat on hard ground from a height of about one meter.
  9. It should be sufficiently hard. No impression should be left on brick surface, when it is scratched.
  10. It should have low thermal conductivity and it should be sound proof.

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