Refractory Technology
Cold crushing strength of ordinary fireclay brick is about 950 kg/cm² . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm² .

450
250
65
150

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Refractory Technology
Silica refractories

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

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