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Synthetic powders are preferred over mined minerals mainly because

  • A.their purity and particle size can be specified and reproduced
  • B.they cost considerably less per tonne than the mined equivalent
  • C.they need no milling of any kind before use in a body
  • D.they can be fired at a lower temperature in every case

Answer: A

A mined mineral carries whatever impurities its deposit contains and varies from face to face, whereas a synthesised powder is made to a specification. That control is what advanced ceramics require, and it is bought at a considerably higher price per tonne.

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