　　Alumina bubble brick is made of alumina hollow spheres and alumina powder as the main raw materials, combined with other binders, and fired at 1750 ℃. It belongs to a kind of energy-saving and heat-preservation material of ultra-high temperature material. Mainly used in petrochemical industry gasification furnace, carbon black industrial reactor, metallurgical industry induction electric furnace and other high-temperature, ultra-high-temperature furnaces are widely used.

Physical and chemical indicators:

Item	Indicator
Item	85	90	99
Maximum use temperature ℃	1680	1700	1800
Al2O3 % ≥	85	90	99
SiO2 % ≤	13	8	0.3
Fe2O3 % ≤	0.2	0.2	0.2
Bulk Density g/cm³	1.4～1.7	1.4～1.7	1.4～1.7
Compressive strength at room temperature Mpa ≥	12	10	9
0.1MPaLoad softening start temperature ℃ ≥	1650	1700	1700
Reburning line change % ≤	1600℃×3h ±0.3	1600℃×3h ±0.3	1600℃×3h ±0.3
Thermal Conductivity【W/(m·K)】average temperature（350±10）℃ ≤	0.8	1.3	1.5

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