FIELD: foundry.
SUBSTANCE: mixture of molding materials comprises aluminum oxide in the alpha phase and / or one mixed aluminum / silicon oxide, with the exception of mixed aluminum / silicon oxides having a layered silicate structure, as a particulate metal oxide in combination with refractory basic molding materials and a water glass-based binder system.
EFFECT: quality improvement of the cast surface is provided.
30 cl, 2 dwg, 3 tbl
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