Refractory Technology
Magnesite chrome refractories

Are not at all resistant to the corrosive action of iron oxide
Have very low (50 kg/cm² ) cold crushing strength (C.C.S.), and can not be used in metalcase form
Have very low thermal co-efficient of expansion
Have better spalling resistance than chrome magnesite refractories

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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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