| Agent Name | SILICIC ACID (H4SIO4) , TETRAETHYL ESTER |
| CAS # | 78-10-4 |
| RTECS # | VV9450000 |
| Agent Code | X4097 |
| Code | Occupation Description (1980) | Total # Employees (Male & Female) |
Total # Female Employees |
| 213 | ELECTRICAL AND ELECTRONIC TECHNICIANS | 74 | 25 |
| 215 | MECHANICAL ENGINEERING TECHNICIANS | 79 | |
| 216 | ENGINEERING TECHNICIANS, N.E.C. | 1,052 | 283 |
| 224 | CHEMICAL TECHNICIANS | 37 | |
| 225 | SCIENCE TECHNICIANS, N.E.C. | 6 | 3 |
| 235 | TECHNICIANS, N.E.C. | 917 | 80 |
| 365 | STOCK AND INVENTORY CLERKS | 3 | |
| 453 | JANITORS AND CLEANERS | 1,147 | |
| 515 | AIRCRAFT MECHANICS, EXC. ENGINE | 62 | |
| 645 | PATTERNMAKERS AND MODEL MAKERS, METAL | 40 | |
| 675 | HAND MOLDERS AND SHAPERS, EXCEPT JEWELERS | 17 | 11 |
| 676 | PATTERNMAKERS, LAY-OUT WORKERS, AND CUTTERS | 17 | |
| 683 | ELECTRICAL AND ELECTRONIC EQUIPMENT ASSEMBLERS | 561 | 466 |
| 703 | LATHE AND TURNING MACHINE SET-UP OPERATORS | 9 | |
| 717 | FABRICATING MACHINE OPERATORS, N.E.C. | 57 | |
| 753 | CEMENTING AND GLUING MACHINE OPERATORS | 352 | 304 |
| 755 | EXTRUDING AND FORMING MACHINE OPERATORS | 74 | 8 |
| 756 | MIXING AND BLENDING MACHINE OPERATORS | 6 | |
| 757 | SEPARATING, FILTERING, AND CLARIFYING MACHINE OPERATORS | 268 | |
| 759 | PAINTING AND PAINT SPRAYING MACHINE OPERATORS | 1,148 | |
| 766 | FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD | 123 | |
| 777 | MISCELLANEOUS MACHINE OPERATORS, N.E.C. | 159 | 62 |
| 785 | ASSEMBLERS | 2,226 | 1,269 |
| 797 | PRODUCTION TESTERS | 147 | 49 |
| 869 | CONSTRUCTION LABORERS | 1,714 | 5 |
| 888 | HAND PACKERS AND PACKAGERS | 129 | 3 |
| TOTAL | 10,422 | 2,566 | |
*(1) The estimates for each occupation apply across the surveyed industries in which the agent was observed. Not all industries were surveyed, and not all agents were observed in all surveyed industries. (2) When using the estimates, standard errors associated with estimates should be considered. (3) Potential exposures to a chemical agent are categorized as actual (i.e., the surveyor observed the use of the specific agent) or tradename (i.e., the surveyor observed the use of a tradename product known to contain the specific agent). The estimates presented in the table combine both categories.