ALTRA® POLYCRYSTALLINE ALUMINA BULK FIBER

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
SiO2
Fe2O3
Other oxides

> 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
Mullite

< 5%
> 60%
30 to 42%
< 5%
< 10%
-
> 42%
< 10%
Fiber Resiliency

Settlement Height ml
Slurry Density g/cm³

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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