Refractory Technology
Fireclay refractories

All of these
Shrink during firing
Are not resistant to the action of basic slags
Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc

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Refractory Technology
Carbon refractories

Have extremely low thermal & electrical conductivities
Do not resist temperature fluctuations
Do not burn/oxidise, when exposed to air on heating
Are not attacked by slags, as they are not wetted by melts

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