MAGMA Bubble Alumina is a rigid, low-density, insulating refractory aggregate. While Bubble Alumina exhibits a bulk density twice that of a premium -grade alumina fiber insulator, Bubble Alumina’s structure consists primarily of closed air-filled thin-walled cells which combine to give it exceptional hot strength and low thermal conductivity.
MAGMA Bubble Alumina is a rigid, low-density, insulating refractory aggregate. While Bubble Alumina exhibits a bulk density twice that of a premium -grade alumina fiber insulator, Bubble Alumina’s structure consists primarily of closed air-filled thin-walled cells which combine to give it exceptional hot strength and low thermal conductivity.
This makes Bubble Alumina an effective high-temperature thermal insulator in structural applications where insulating capabilities cannot be sacrificedand appropriate for use at temperatures as high as 1825°C. It is pre-fired, contains no organics and exhibits high microwave and RF transparency. Its high alumina content makes it compatible with many extreme chemical environments. Bubble Alumina is manufactured on a custom basis and can be supplied in many complex shapes.
| Items | Unit | Index | ||
| Chemical composition | Al2O3 | % | 99.00min | |
| SiO2 | % | 0.20max | ||
| Fe2O3 | % | 0.15max | ||
| Na2O | % | 0.25max | ||
| Refractoriness | ℃ | 1800min | ||
| Packing density | g/cm3 | 1.0max | ||
| Grain Size | ＞0.20mm | 80%min | ||
| ≤0.20mm | 10%max | |||
