Table 5.
Estimates of the number and percentage of workers potentially exposed to crystalline silica by selected industries, IMIS (1988–2003).
| Industrya (SIC code) | No.b of workers in the establishment | Percent of workers exposedc | Total no. of potentially exposed workersd |
|---|---|---|---|
| Metal valves and pipe fittings (3494) | 18,080 | 0.63 | 114 |
| Special industry machinery (3559) | 111,312 | 0.56 | 623 |
| Automotive repair paint shop (7532) | 205,906 | 12.2 | 25,027 |
| Soap and other detergents (2841) | 30,352 | 1.4 | 438 |
| Testing laboratories services (8734) | 82,786 | 22.3 | 18,497 |
| Gray iron foundries (3321) | 82,749 | 1.7 | 1,395 |
| Manufacturing explosives (2891) | 21,322 | 5.3 | 1,131 |
| Fabricated rubber products (3069) | 56,079 | 1.2 | 698 |
| Masonry, stonework (1741) | 168,155 | 12.7 | 21,302 |
| Brick, stone, related material (5032) | 34,241 | 6.4 | 2,203 |
| Repair shops, NEC (7699) | 212,049 | 8.0 | 17,022 |
| Transmission equipment (3568) | 20,884 | 2.1 | 438 |
| Chemical preparations, NEC (2899) | 34,873 | 7.9 | 2,766 |
| Mining machinery equipment (3532) | 13,631 | 2.4 | 329 |
| Plastics plumbing fixtures (3088) | 16,793 | 15.9 | 2,670 |
| Plastering drywall work (1742) | 262,530 | 4.8 | 12,459 |
| Tile, marble, and mosaic work (1743) | 38,051 | 29.5 | 11,228 |
| Surgical appliances supplies (3842) | 96,154 | 1.1 | 1,041 |
| Total | 1,505,947 | 7.9 | 119,381 |
NEC, not elsewhere classified.
Industries with the highest and lowest geometric mean where at least five samples were available.
Number of workers in the establishments, as reported to the U.S. Census Bureau (1997)
Percentage of workers exposed was calculated by dividing the number of workers exposed as determined by the inspector, and the number of workers in the establishment, as reported to the OSHA inspector by the facility.
Total number of potentially exposed workers in an SIC was calculated by taking the product of the proportion of workers exposed in each SIC by the average worker population employed nationally in each SIC, as reported to the U.S. Census Bureau (1997).