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Alumina is the most widely used engineering ceramic chiefly because it combines

  • A.hardness and refractoriness with moderate cost
  • B.the lowest cost of any ceramic material
  • C.high electrical conductivity with low hardness
  • D.plasticity when mixed with a little water

Answer: A

It is hard, chemically resistant, a good electrical insulator and available in quantity at a price that many applications will bear. Nothing else matches that particular combination across so wide a range of uses. It accounts for the great majority of technical ceramic tonnage.

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