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| Composition of the initial component, mass % | ||||||||||
| Composite index | Prosyanaya kaolin (Ukraine) | Al | Al2O3 | SiC | Si | Perlite Aragats (Armenia) | Y2O3 | MgO | B4C | Carbon fiber | |
| C-9 | 6.5 | 18.0 | 22.0 | 18.0 | 22.0 | 2.0 | 1.5 | 1.0 | 9.0 | _ | |
| C-10 | _ | 20.0 | 19.0 | 20.0 | 22.0 | _ | 1.5 | 1.0 | 13.5 | 3 | |