COMPRESSIVE STRENGTH :

The bricks when tested in accordance with the procedure laid down shall have a minimum average compressive strength for various classes as given in Table 2. The compressive strength of any individual brick tested shall not fall below the minimum average compressive strength specified for the corresponding class of brick by more than 20%. In case compressive strength of any individual brick tested exceeds the upper limit specified in Table 2 for the corresponding class of bricks, the same shall be limited to upper limit of the class as specified in Table 2 for the purpose of calculating the average compressive strength.

1.1.3.4 WATER ABSORPTION

The average water absorption of bricks when tested in accordance with the procedure laid down in appendix shall be not more than 20% be weight.

1.1.3.5 EFFLORESCENCE

The rating of efflorescence of bricks when tested in accordance with the procedure laid down shall be not more than moderate.