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Granule strength for a pressing powder should be

  • A.as low as it can possibly be made by any means
  • B.entirely irrelevant to the quality of the compact
  • C.high enough to survive handling but low enough to crush
  • D.as high as it can possibly be made by any available means

Answer: C

Correct answer: high enough to survive handling but low enough to crush

Spray-dried granules must survive transport, storage and flow into the die without breaking down into fines, which would ruin the flow and the fill. But they must then crush completely under the punch, because any granule surviving into the compact remains as a defect that sintering will not remove. Granule strength is therefore adjusted by binder content and type to sit between those two requirements.

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