| Silicon Oxide | Aluminum Oxide | Magnesium Oxide |
| Titanium Oxide | Zirconium Oxide |
| CeramTec North America | CoorsTek | Cotronics |
| Du-Co Ceramics Company | Ferro Corporation | Gouda Vuurvast |
| Michelman® | Mid-Mountain Materials | Minelco Inc. |
| Misumi | Piezo Kinetics, Inc. | Solvay Chemicals |