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Wire cutting of an extruded column produces a characteristic

  • A.hollow channel through the centre
  • B.slightly rough or dragged face
  • C.perfectly polished glass-like surface
  • D.glazed and fired outer skin

Answer: B

Correct answer: slightly rough or dragged face

A wire pulled through the plastic column tears rather than cuts, leaving a slightly rough face and often a lip where the wire exits. It is a recognised characteristic rather than a fault, and where a better finish is wanted the face is smoothed afterwards or a different cutting method is used.

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