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Discussion

A firing trial on a raw material is carried out to determine

  • A.the full particle size distribution of it
  • B.the cation exchange capacity of the clay
  • C.shrinkage, colour and absorption after firing
  • D.the elements that are present in the material

Answer: C

No instrumental analysis predicts fired colour and shrinkage reliably enough to dispense with the trial. It is the only test that reproduces what the material will actually do in production. Small-scale firing remains the final arbiter for any new material.

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