| Diameter | 25.0 mm |
| Edge Features | < 0.2 mm |
| Side 1, Roughness, Ra | polished, Ra < 15 nm (over 1mm2) ,special requirements upon request |
| Side 2, Roughness, Ra | polished, Ra < 15 nm (over 1mm2), special requirements upon request |
| Thickness Dimension | customized |
| Thermal Conductivity | 2000 Wm-1K-1 |
| Infrared Transmittance(wavelength: 220nm-50μm) | >68% ( except for 4-6 μm position) |