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The water content of a plastic ceramic body for extrusion is typically

  • A.around 15 to 25 per cent by mass
  • B.around 2 to 5 per cent by mass
  • C.around 50 to 60 per cent by mass
  • D.close to 80 per cent by mass

Answer: A

Correct answer: around 15 to 25 per cent by mass

That range gives a body stiff enough to hold its shape as it leaves the die and soft enough to flow through it. Dry pressing uses a few per cent, and slip casting 25 to 45, so the three forming routes occupy three distinct bands of water content.

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