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Linear change on reheating means that the size of refractory products is irreversible changed when the refractory products are heated to high temperature. A positive value indicates expansion which is called expansion of linear change on reheating; negative value indicates contraction which is called contraction of linear change on reheating.

corundum block is a refractory product made of corundum based crystalline phase in which the alumina content is more than 90%. Corundum block can be divided into two kinds which are sintered corundum brick and fused corundum brick. They are made by sintering alumina and fused corundum as raw materials or combining Al2O3 / SiO2 bauxite clinker and with sintered alumina, then produced by sintering method.