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Deflocculation of a casting slip is desirable because it allows

  • A.a high solids content at a low viscosity
  • B.a low solids content at a high viscosity
  • C.the slip to set solid in the bucket
  • D.the mould to be made of metal instead

Answer: A

Particles carrying a like charge repel one another and the suspension flows freely even when heavily loaded. A high solids content means less water to remove, which speeds casting and reduces drying shrinkage. Water removed later has to be paid for in kiln time and in cracking risk.

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