BS 7225-1-1.4:1989 - Classification of refractories. Shaped refractory products - Basic products containing more than 7% carbon
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This British Standard defines the classification system for shaped refractory products that are basic in composition (i.e. primarily containing basic oxides like MgO or CaO) and contain more than 7% carbon by weight.
These products are primarily used in high-temperature industrial applications, especially where resistance to slag corrosion, thermal shock, and oxidation is critical — such as in steelmaking furnaces, ladles, and converters.