The colour of brick depends upon the amount of iron oxide present in the clay.

Linseed oil is rapidly soluble in

The expansion of cement should not exceed

A good building stone is one which does not absorb more than

The percentage of alumina in a good brick clay should vary from

The sand is mixed with lime mortar to

Gneiss is chemically classified as

The average out-turn of first class bricks in clamp burning is about

The clinker is formed at a temperature of