Discussion
Three of the following are properties required of a working-face refractory. The exception is
Answer: B
Correct answer: high porosity
Porosity is what an insulating refractory needs, not a working-face one. At the hot face, pores admit slag and gas into the body of the brick and accelerate its destruction, so a dense low-porosity brick is wanted there, backed by a porous insulating layer behind it. The other three - spalling resistance, refractoriness under load and slag resistance - are all working-face requirements.
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