First Class Bricks
Second Class Bricks
Third Class Bricks
Specification of First Class Bricks
- Made of good earth which is free from saline deposits and are sand molded.
- Burnt thoroughly without being vitrified and have deep red, cherry and copper color.
- Regular and uniform in shape and size with sharp and square edges and parallel faces.
- Must be homogeneous in texture and emit a clear ringing sound on being struck together.
- Free from flaws, cracks, chops, stones and lime.
- Should not absorb water more than 20% of its own dry weight after 24 hours, immersion in cold water.
- Have a minimum crushing strength of 105 kg per sq. cm when tested according to the test.
- Should not show appreciable sign of efflorescence either in dry state or subsequent to soaking in water.
NOTE: As per guidelines of all wings of the Government, semi-Government departments and other construction departments, First Class Brick tiles should be used for construction works.
Specification of Second Class Bricks
- They shall be well burnt or slightly over burnt.
- They must give clear ringing sound when struck.
- The may have slight irregularities in size, shape and color.
- They may have slight chips, flaws or surface crack but must be free from lime or kankar.
- The minimum crushing strength of second class brick should be 70 kg per sq cm.
Specification of Third Class Bricks
- These bricks are slightly under burnt or over burnt.
- They are not uniform in shape, size and edges.
- They shall not observe water more than 25% of their own dry weight after 24 hours, immersion in cold water.
- They have some signs of efflorescence.