Currently, when discussing insulation for high-temperature kilns, we often mention refractory fiber, and many people confuse refractory fiber with alumina-silicate fiber. Now, let's discuss what exactly is refractory fiber?

Refractory fibers are a general term for crystalline and amorphous fibrous materials with a melting point above 1580°C. They can be categorized into: silicate-alumina fibers, primarily composed of Al2O3 (alumina) and SiO2 (silica); alumina crystalline fibers, primarily composed of Al2O3 (alumina); and special oxide fibers, such as zirconia ZrO2 and forsterite fibers, with melting points above 1500°C. Therefore, the classification of refractory fibers is quite broad. The silicate-alumina fiber products commonly used in high-temperature furnace and equipment insulation are just one type of refractory fiber.

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