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| Glass state | Nucleated | Crystallized |
Density | ρ | g/cm3 | 2.51 | - | - |
Flexural strength (DIN EN ISO 6872) | σ | MPa | 94 ± 22 | 146 ± 29 | 217 ± 41 |
Fracture toughness (ISO 23146) | KIC | MPam1/2 | 0.72 ± 0.02 | 0.90 ± 0.10 | 1.72 ± 0.13 |
Refractive index | n | - | 1.52 | 1.54 | - |