All commercial alumina-silica refractories were found to be wetted and subsequently penetrated on exposure to molten aluminum. Penetration and silicon pickup by the aluminum was independent of porosity, grade of refractory, and source of the refractory material. The rate of penetration was governed by the diffusion of aluminum and silicon. The adherence of build-up to alumina-silica refractories is related to the silica content of the refractories.

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