Pick out the wrong statement?

A. Graphite refractories are also called plumbago refractories

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

C. Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks

D. Calcined magnesite is also called dead burnt magnesite

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