Types of Bricks in civil construction work ?

We all know that Bricks play a vital role in the building construction work,
Generally, There are Three Types of bricks in construction :-
(A). First Class Bricks
(B). Second Class Bricks
(C). Third Class Bricks

(A). First Class Bricks :- These Bricks have following features
                          (1). They have uniform colour.
                          (2). They have uniform size.
                          (3). Water absorption is less then 20% if immersed in water foor 24 hours.
                          (4). Crushing strength of bricks is 105 kg/cm2.
                          (5). They are uniformly burnt..
                          (6). These bricks have high quality.
                        
(B). Second Class Bricks :- These bricks have following features
                          (1). Quality of these bricks is little bit less then first class bricks.
                          (2). Size may be slightly differ .

                          (3). Water absorption is less then 22% if immersed in water foor 24 hours.

                          (4). Crushing strength of bricks is 70 kg/cm2.

                          (5). These bricks may be slightly over or less burnt.

 (B). Second Class Bricks :- These bricks have following features

                          (1). Quality of these bricks is not so good.

                          (2). Size may be differ .

                          (3). Water absorption is less then 25% if immersed in water foor 24 hours.

                          (4). Crushing strength of bricks is 30 kg/cm2.

                          (5). These bricks may be over burnt or less burnt

Note:- bricks are also classified by material.