| Agent Name | SILICIC ACID (H4SI3O8), MAGNESIUM SALT (1:2), MONOHYDRATE |
| CAS # | 1343-90-4 |
| RTECS # | OM4360000 |
| Agent Code | E0842 |
| Code | Occupation Description (1980) | Total # Employees (Male & Female) |
Total # Female Employees |
| 224 | CHEMICAL TECHNICIANS | 1,433 | 179 |
| 235 | TECHNICIANS, N.E.C. | 2,080 | |
| 364 | TRAFFIC, SHIPPING, AND RECEIVING CLERKS | 90 | |
| 365 | STOCK AND INVENTORY CLERKS | 115 | |
| 366 | METER READERS | 2,207 | |
| 453 | JANITORS AND CLEANERS | 5,520 | 38 |
| 507 | BUS, TRUCK, AND STATIONARY ENGINE MECHANICS | 1,153 | |
| 516 | HEAVY EQUIPMENT MECHANICS | 850 | |
| 518 | INDUSTRIAL MACHINERY REPAIRERS | 5,720 | |
| 519 | MACHINERY MAINTENANCE OCCUPATIONS | 90 | |
| 534 | HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS | 5,714 | |
| 539 | MECHANICAL CONTROLS AND VALVE REPAIRERS | 700 | |
| 544 | MILLWRIGHTS | 234 | |
| 549 | NOT SPECIFIED MECHANICS AND REPAIRERS | 3,267 | 33 |
| 557 | SUPERVISORS; PLUMBERS, PIPEFITTERS, AND STEAMFITTERS | 3,250 | |
| 558 | SUPERVISORS, N.E.C. | 275 | |
| 567 | CARPENTERS | 72 | |
| 585 | PLUMBERS, PIPEFITTERS, AND STEAMFITTERS | 19,215 | |
| 633 | SUPERVISORS, PRODUCTION OCCUPATIONS | 454 | 62 |
| 637 | MACHINISTS | 966 | |
| 653 | SHEET METAL WORKERS | 2,286 | |
| 684 | MISCELLANEOUS PRECISION WORKERS, N.E.C. | 2,388 | |
| 696 | STATIONARY ENGINEERS | 161 | |
| 703 | LATHE AND TURNING MACHINE SET-UP OPERATORS | 556 | 62 |
| 719 | MOLDING AND CASTING MACHINE OPERATORS | 1,667 | 803 |
| 759 | PAINTING AND PAINT SPRAYING MACHINE OPERATORS | 65 | 7 |
| 783 | WELDERS AND CUTTERS | 319 | |
| 785 | ASSEMBLERS | 2,278 | 641 |
| 796 | PRODUCTION INSPECTORS, CHECKERS, AND EXAMINERS | 123 | 62 |
| 844 | OPERATING ENGINEERS | 1,883 | |
| 859 | MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS | 1,509 | 119 |
| 865 | HELPERS, CONSTRUCTION TRADES | 549 | |
| 869 | CONSTRUCTION LABORERS | 941 | |
| TOTAL | 68,129 | 2,005 | |
*(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.