It is adapted to high-temperature environments of 1300°C-1600°C, carrying zirconia crown blanks. Through uniform heat transfer, it prevents cracking; through physical isolation, it prevents pollution; and with chemical inertness, it maintains purity and color. It is a core accessory for crown production.
| Component Name | Content (%) |
| Loss on Ignition LOSS (1025℃) | <0.05 |
| Aluminum Oxide (Al₂O₃) | 87.66 |
| Silicon Dioxide (SiO₂) | 11.69 |
| Iron Oxide (Fe₂O₃) | 0.15 |
| Calcium Oxide (CaO) | 0.12 |
| Magnesium Oxide (MgO) | <0.01 |
| Potassium Oxide (K₂O) | 0.08 |
| Sodium Oxide (Na₂O) | 0.14 |
| Titanium Dioxide (TiO₂) | 0.07 |
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