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Wollastonite is added to tile bodies chiefly because it

  • A.releases no gas on firing and speeds the cycle
  • B.makes the body workable without any clay present
  • C.increases how much the piece contracts on drying
  • D.keeps the body wholly crystalline after firing

Answer: A

Being a calcium silicate rather than a carbonate it contributes lime without evolving carbon dioxide, which suits fast-fire tile production. Its needle-like particles also reduce drying shrinkage and raise green strength.

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