Discussion
Assertion (A): Kyanite is used in refractory bodies partly to offset shrinkage.
Reason (R): It expands substantially when it converts to mullite on firing.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the mechanism. Kyanite expands by some fifteen to eighteen per cent as it converts to mullite, and that expansion is used deliberately to offset the shrinkage of the surrounding body during firing. Balancing the two gives a refractory that comes out of the kiln close to the size it went in, which matters when the shapes must fit a furnace lining.
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