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End capping, a defect in pressed compacts, appears as

  • A.a crack running the full length of the part
  • B.a rough surface finish on the outside
  • C.a hole through the centre of the piece
  • D.a cone or disc separating from one face

Answer: D

Stored elastic energy releases as the compact leaves the die and shears a cap off one end. Reducing the pressing rate, improving lubrication and tapering the die exit all help to control it. The fault appears at ejection rather than under load.

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