ALTRA® POLYCRYSTALLINE ALUMINA BULK FIBER
Polycrystalline Alumina Bulk Fiber
ALTRA® bulk alumina fibers are high-purity, low shot content polycrystalline
materials for refractory insulation applications up to 1800°C (3000°F). ALTRA®
fibers are manufactured via a sol-gel solution process to control fiber diameter and
non-fibrous shot content. Controlled firing yields the optimal crystalline phase for
maximum resistance to thermal shrinkage at elevated temperatures. Two grades
are available for a broad range of applications.
ALTRA® B72
Mullite composition, superior thermal shrinkage resistance, compressibility, and resiliency. Preferred composition for vacuum forming of boards for oxidizing and neutral atmospheres up to 1800°C.
ALTRA® B97
High-alumina composition, used for vacuum forming boards with excellent resistance to reduction in dry hydrogen and vacuum atmospheres up to 1650°C. Preferred composition for vacuum forming of boards for resistance to chemically induced shrinkage from direct contact with most vapors and solids, including alkalis, acids, and iron oxides.
| ALTRA® POLYCRYSTALLINE ALUMINA BULK FIBER | ||||
| Properties | ALTRA® GRADE | |||
| B 72 | B 97 | B 97 LA | B 97 HA | |
| Typical Composition Al2O3 |
> 71 < 28 < 0.1 < 0.2 |
> 96 < 3.5 < 0.1 < 0.2 |
> 96 < 3.5 < 0.1 < 0.2 |
> 96 < 3.5 < 0.1 < 0.2 |
| Crystalline Phases α-Alumina |
< 5% > 60% |
30 to 42% < 5% |
< 10% - |
> 42% < 10% |
| Fiber Resiliency Settlement Height ml |
200 to 250 0.025 |
150 to 180 0.028 – 0.033 |
180 to 200 0.025 – 0.028 |
150 0.033 |
| Shot Content > 75 Microns (> .003”) | < 1% | < 1% | < 1% | < 1% |
| Fiber Diameter μm | 2 to 4 | 2 to 4 | 2 to 4 | 2 to 4 |
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