Refractory Technology
Graphite or carbon refractories

Exhibit high shrinkage on thermal treatment
Should be used in neutral or reducing atmosphere
Are not resistant to corrosion by slag
Exihibit wetting characteristics

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Refractory Technology
Silica refractories

Can not be used in the dome of hot blast stoves
All of these
Have lower thermal conductivity than fireclay bricks
Crack when subjected to sudden change of temperature

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