Alumina Hollow Sphere Brick
Alumina hollow sphere brick is a lightweight refractory composed primarily of sintered alumina hollow spheres bonded within an alumina matrix. It is used for thermal insulation structures where reduced bulk density and stable service at elevated temperatures are required.
Description
The brick is manufactured by forming and firing a structure that incorporates hollow alumina spheres (closed-cell granules) into a continuous ceramic matrix. The internal voids of the spheres help limit heat transfer, while the alumina composition supports chemical stability at temperature. Grades and dimensions are selected according to lining design, load conditions, and installation method.
Applications
- Insulation courses in metallurgical, ceramic, and heat-treatment furnaces
- Backup lining in glass furnaces and petrochemical heating equipment
- Intermediate thermal barrier layers to reduce heat loss where mechanical loads are moderate
- Lightweight zones that seek to reduce lining mass and thermal inertia
Packaging
- Generally supplied on wooden pallets or in cartons with protective wrapping
- Labels indicate product name, dimensions/specification, and batch identification
- Handle to avoid edge chipping and impact damage during loading and transport
Storage
- Store in a dry, covered, and ventilated area to limit moisture uptake
- Avoid outdoor exposure to rain or prolonged humidity before installation
- Stack on flat wooden supports; do not overload upper tiers