The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is

The refractory brick which has good thermal shock resistance at high

1.	The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is
A.	Magnesite
B.	Chrome
C.	Silica
D.	Fireclay
Answer» D. Fireclay

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The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is

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