- It should have proper proportions of sand, silt and clay.
- It should have uniform shape , size & colour.
- Brick Should be hard enough so that it is not scratched by fingernail.
- A sharp metallic sound indicates good burning.
- It must be homogeneous.
- It should have sufficient plasticity so that bricks can be properly and conveniently moulded with sharp and well defined edges.
- It must be free from lumps of lime or nodules of kankar.
- It must be free from pebbles, grits and lumps of earth.
- It must free from alkaline salts, kallar or reh etc.
- It must not contain vegetable and organic matter.
