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A material described as non-plastic in ceramics is one that

  • A.cannot be used in a ceramic body at all whatever
  • B.is chemically inert at every possible temperature
  • C.must always be the major constituent of the body
  • D.contributes no forming plasticity of its own

Answer: D

Quartz, feldspar, alumina and grog are all non-plastic and must be carried by a plastic component or by an added binder. The term describes forming behaviour rather than any chemical property. A material can be chemically reactive and still be non-plastic.

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