| Silicon Oxide | Aluminum Oxide | Magnesium Oxide |
| Titanium Oxide | Zirconium Oxide |
| American Elements | Astro Met Inc. | BCC Products |
| CeramTec North America | COI Ceramics | Malvern Minerals Company |
| Mateck GmbH | Michelman® | Pyrotek, Inc. |
| Thermal Ceramics | Unifrax I LLC | Zircar Refractory Composites, Inc. |