Refractory Technology
Refractory bricks having lower porosity have

High insulating properties
Greater strength
Low heat capacity
Low thermal conductivity

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Refractory Technology
Fireclay refractories

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
All of these

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