Question: A good brick earth should contain : about 2 0 % to 3 0 % of alumina about 5 0 % to 6 0 %

A good brick earth should contain :
about 20% to 30% of alumina
about 50% to 60% of silica
not more than 5% of lime
about 5 to 6% of oxide of lime
All the above.

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