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Grog and calcined alumina used as fillers share the property that they

  • A.have already been fired and shrink no further
  • B.melt very readily at quite a low temperature
  • C.give the body the whole of its wet plasticity
  • D.dissolve completely away into the glassy phase

Answer: A

Having been through a firing they contribute no further shrinkage, which is why they are used to control dimensions in large or thick pieces. Their inertness during firing is exactly what makes them fillers rather than fluxes.

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