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 refer to a general term for crystalline and amorphous fibrous materials with a refractoriness greater than 1580°C. They can be categorized into silicate alumina fibers, which are primarily composed of Al2O3 (alumina) and SiO2 (silica); alumina crystalline fibers, primarily composed of Al2O3; and special oxide fibers such as zirconia ZrO2 crystalline fibers with a refractoriness greater than 1500°C, magnesium olivine fibers, and others. Therefore, the classification of refractory fibers is quite extensive. The silicate alumina fiber products commonly used for insulation in high-temperature kilns and equipment are just one type of refractory fiber.

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