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 Hi-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.

Also available chopped or milled to custom fiber lengths

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