Part XIII. Manufacturing Industries - ILO Encyclopaedia
2021-8-9u2002·u2002Arc-fused refractory grain or aggregate had been made since the early 1900s, and fused-cast refractory bricks of several compositions followed in the twenties and thirties, notably of mullite, alumina, magnesia-alumina-silica and alumina-zirconia-silica. More often than not, these products were made entirely from mineral raw materials.
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