| Parameter | Value |
|---|---|
| SiO₂ Content | 99.9% |
| Density | 2.2 g/cm³ |
| Mohs Hardness | 6.6 |
| Melting Point | 1732°C |
| Working Temperature | 1100°C |
| Maximum Short-term Temperature | 1450°C |
| Visible Light Transmittance | Above 93% |
| UV Spectral Transmittance | 80% |
| Annealing Point | 1180°C |
| Softening Point | 1630°C |
| Strain Point | 1100°C |