A . Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks.
B . Graphite refractories are also called plumbago refractories.
C . Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28.
D . Calcined magnesite is also called dead burnt magnesite.
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