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$Henan Dengfeng Guangda Refractory Co., Ltd$ $Henan Dengfeng Guangda Refractory Co., Ltd$

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Alumina Hollow Sphere Brick

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Insulating Refractory

Product introduction

Alumina hollow-sphere bricks are lightweight, high-temperature-resistant, and highly energy-efficient refractory materials that exhibit exceptional stability under a wide range of atmospheres. These bricks are suitable for use in high-temperature, energy-saving kilns—such as updraft kilns, shuttle kilns, molybdenum-wire furnaces, tungsten-rod furnaces, induction furnaces, and nitriding furnaces—where they can significantly reduce furnace weight, optimize structural design, conserve materials, and achieve substantial energy savings. Zirconia hollow-sphere products, entirely fabricated from zirconia hollow spheres, boast excellent high-temperature strength and a stable pore structure, making them ideal as thermal insulation materials for components such as furnace roofs in ultra-high-temperature equipment, including medium-frequency high-temperature furnaces, carbon-black reaction furnaces, tungsten-rod furnaces, and molybdenum furnaces.

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Product details

Project	Alumina Hollow Sphere Brick			Zirconia Hollow Sphere Brick
Project	BA-85	BA-90	BBA-99	BZ-98
Al ₂ O ₃ %,≥	1680	1700	1800	2200
ZrO _² %, ≤	85	90	99	-
Silicon dioxide ₂ %,≤	-	-	-	≥98 (including stabilizer)
Fe ₂ O ₃ %,≤	0.2	0.2	0.2	0.2
Bulk density, g/cm ³	1.4–1.7	1.4–1.7	1.4–1.7	≤3.0
Compressive strength at room temperature, MPa, ≥	12	10	9	8
Start temperature of load-softening, (0.1 MPa, 0.6%), °C, ≥	1650	1700	1700	1700
Percentage change in the re-burn line	±0.3	±0.3	±0.3	±0.2
Thermal conductivity (at an average temperature of 800°C), W/(m·K), ≤	0.8	1.3	1.5	0.3
Application	It is primarily used as the lining material for high-temperature kilns in industries such as refractories, industrial ceramics, electronic ceramics, petrochemicals, and metallurgy, as well as for thermal insulation in ultra-high-temperature kilns.

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Alumina hollow sphere brick

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$GuanDa Refractory Material Co., Ltd. of Dengfeng City, Henan Province$

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+86-371-62986719

East Section of Yingbin Avenue, Ludian Town, Dengfeng City

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