Acidic,Basic and Neutral are types of

Porous and Polished are types of

.........................is made from ordinary clay by burning it at lower temperature

.........................is made from mixture of refractory clay,crushed pottery and powdered stone  by burning it at high temperature .........................

.........................is made from mixture of  clay,kaolin,quartz and felspar by burning it at high temperature

Size of conventional brick is

Size of standard brick is

Compressive strength of first class brick should not be less than

Compressive strength of second class brick should not be less than

Compressive strength of third class brick should not be less than