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Fireclay refractories are the most widely used of all because they combine adequate performance with

  • A.low cost
  • B.the highest refractoriness of any material
  • C.resistance to strongly basic slags
  • D.a very high thermal conductivity

Answer: A

Alumino-silicate clay is abundant and cheap, and it serves wherever the temperature is moderate and the slag is not strongly basic. The severe duties are given to magnesite, chromite or zirconia at many times the price.

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