　　Corundum brick is mainly made by fused white corundum, tabular corundum, super fine alumina powder through mixing them as per certain ratio, high pressure forming and burning under high-temperature. It’s a type of refractory product featuring high temperature resistance, high compression strength, high-temperature erosion resistance, scouring resistance, etc. It’s mainly used at key parts of kilns for steel, petrochemical, fertilizer, nonferrous metal, electronic and other industries.

Physical and chemical indicators：

Item	GYZ-99A	GYZ-99B	GYZ-98	GYZ-95
Al2O3 % ≥	99	99	98	95
SiO2 % ≤	0.15	0.20	0.50	-
Fe2O3 % ≤	0.10	0.15	0.20	0.30
Apparent porosity % ≤	19	19	19	20
Volume density g/cm³ ≥	3.20	3.15	3.15	3.10
Ambient compression strength Mpa ≥	80	80	80	100
Changes in heating permanent line (16000°C×3h)）%	-0.2~+0.2	-0.2~+0.2	-0.2~+0.2	-0.3~+0.3
load softening starting temperature（0.2Mpa，0.6%） ℃	1700	1700	1700	1700

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