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Fining of molten glass is the operation of

  • A.adjusting the composition to specification
  • B.cooling the glass to the forming temperature
  • C.removing dissolved and entrained gas bubbles
  • D.removing solid inclusions by filtration

Answer: C

Sulphate or another fining agent releases gas that sweeps the small bubbles out as it rises. Seeds and blisters left in the glass are among the commonest defects in flat and container ware. The bubbles come from the melting reactions themselves.

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