Table 1.
Particle and fiber exposures associated with ferruginous body formation
| Inorganic core |
| Silicates and silica |
| Asbestos |
| Talc/sheet silicates |
| Kaolinite/aluminum silicates |
| Diatomaceous earth |
| Erionite |
| Silica |
| Fiberglass/glass |
| Refractory ceramic fibers |
| Silicon carbide |
| Metal compounds and oxides |
| Aluminum compounds |
| Stainless steel |
| TiO2 |
| Iron oxides |
| Ashes (fly ash from fuel and ash from leaves) |
| Carbonaceous core |
| Cigarette smoke particle |
| Soot |
| Wood stove particle |
| Coal dust |
| Cotton fibers |
| Synthetic fibers |