Pick out the wrong statement?

A. Graphite refractories are also called plumbago refractories

B. Calcined magnesite is also called dead burnt magnesite

C. Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28

D. Insulating refractories used in place of regular refractory bricks are usually called light weight

E. ractories, and they have similar composition as heavy bricks

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