Alumina bubble brick is made from fused alumina bubbles with high-purity alumina matrix, serving at 1600-1800°C with low thermal conductivity, good strength and direct flame contact for high-temperature kiln insulating and working layers.
| Al₂O₃ content | ≥ 90% |
|---|---|
| Bulk density | 1.3～1.7 g/cm³ |
| Cold crushing strength | ≥ 8 MPa |
| Thermal conductivity (1000℃) | ≤ 0.8 W/(m·K) |
| Reheat linear change (1600℃×3h) | ±0.3% |
| Refractoriness | ≥ 1800℃ |
| Service temperature | 1600～1800℃ |
Alumina bubble brick is a high-performance lightweight refractory made from fused alumina bubble (high-purity corundum hollow spheres, Al₂O₃ ≥ 99%) as aggregate, with high-purity alumina micropowder and binder as matrix, fired at high temperature. The hollow sphere structure gives the brick extremely low thermal conductivity and heat capacity while maintaining relatively high cold strength. With a service temperature of 1600–1800°C, it can serve both as an insulating layer and as a flame-contact working layer, making it an upgraded choice over ordinary lightweight bricks for high-temperature service.
Ordinary lightweight bricks (light high alumina, light mullite) generally serve at 1300–1500°C, suitable for insulating layers; alumina bubble brick uses high-purity fused corundum hollow spheres as aggregate, serving at 1600–1800°C with higher strength and direct flame contact — the upgraded choice for high-temperature conditions.
The aggregate is fused alumina bubble — hollow spheres with closed pores that greatly reduce thermal conductivity while maintaining strength. It is the core feature of high-temperature lightweight brick.
Yes. With high refractoriness and good chemical stability, alumina bubble brick is widely used as a flame-contact working layer, and also as an insulating layer behind dense brick.
Yes. Henan Songrui New Refractory Materials Co., Ltd. supports standard, special-shaped and arched or holed bricks machined per drawing.
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