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Respirable crystalline silica is a hazard specifically in

  • A.the wet slip drawn off after milling is complete
  • B.the fired product standing in the finished goods warehouse area
  • C.the fine dust raised when quartz-bearing materials are handled dry
  • D.the coarse sand that is handled out in the open storage yard area

Answer: C

Only particles small enough to reach the deep lung cause silicosis, and they are generated by dry handling and cleaning rather than by the material at rest. Wet processing and enclosed transfer are the primary controls.

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