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Lubricants added to a pressing powder serve chiefly to

  • A.reduce friction against the die walls
  • B.increase the strength of the green body
  • C.lower the sintering temperature required
  • D.improve the colour of the fired piece

Answer: A

Friction at the wall produces a density gradient through the compact and makes ejection difficult. A stearate or wax reduces both problems and is burnt out with the binder during firing. Neither additive survives into the finished ceramic.

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