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A functional classification of ceramic raw materials would group them by

  • A.the year in which they were first used
  • B.the role each plays in the body
  • C.the alphabetical order of their names
  • D.the depth at which they were quarried

Answer: B

Plasticiser, flux, filler and refractory describe what a material does rather than what it is, and one material may serve different roles in different bodies. This is generally the most useful way of thinking about a formulation.

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