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.