Silica

Did you know?

  • At least 1.7 million U.S. workers are exposed to respirable crystalline silica in a variety of industries and occupations
  • There are over thirty major industries and operations where exposures to crystalline silica can occur.Silica is a compound composed of the elements silicon and oxygen (chemical formula SiO2)
  • Quartz is the most common form of crystalline silica and accounts for almost 12% by volume of the earth's crust
  • Cristobalite is a form of crystalline silica that is formed at high temperatures (>1470 °C) 
  • Respirable crystalline silica presents risks of lung cancer, silicosis, and non-malignant respiratory disease (NMRD) as well as autoimmune and renal disease risks to exposed workers

Occupational Exposure includes:

  • Cutting
  • Sawing
  • Drilling
  • Crushing of concrete, brick, block, rock, mortar and stone products
  • Sanding on drywall mud

1926.1153 Respirable Crystalline Silica - Effective Dates:

  • June 23, 2016- This standard shall become effective
  • June 23, 2017- All obligation of the standard shall become effective
  • September 23, 2017- OSHA enforcement of the standard 

This section applies to all occupational exposures to respirable crystalline silica in construction work, except where employee exposure will remain below 25 micrograms per cubic meter of air (25 μg/m3) as an 8-hour time-weighted average (TWA) under any foreseeable conditions.

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Synopsis of the Silica Standard.pdf
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