The K9 quartz spherical dome integrates the advantageous properties of both K9 optical glass and fused quartz. From a material standpoint, K9 glass is lead-free and exhibits high transparency, excellent refractive characteristics, and strong resistance to laser-induced damage—classifying it as a low-dispersion optical glass. Fused quartz, on the other hand, offers exceptional chemical stability; its internally hollow microstructure, high moisture absorption capacity, and abundant surface porosity make it highly conducive to the proliferation of nitrifying bacteria. Optically, the K9 quartz spherical dome delivers outstanding performance: K9 glass provides high transmittance, allowing maximum light transmission through the dome, while the porous internal structure of the quartz component introduces controlled light scattering and refraction—resulting in more uniform illumination inside the dome. Mechanically, both K9 glass and fused quartz outperform other high-refractive-index materials. K9 glass is shaped via precision cutting, grinding, polishing, or hot-press casting, yielding a structurally robust and impact-resistant form. Fused quartz features a dense, non-powdering microstructure. Regarding environmental resilience, the K9 quartz spherical dome demonstrates superior resistance to acids, alkalis, and humidity.
| Coating | Anti-reflective (AR) coating |
| Diameter | 6-100mm |
| Dimensional tolerance | +/-0.1mm |
| Thickness tolerance | +/-0.1mm |
| Radius-of-curvature error | ΔR/R ≤ ±0.2% |
| Surface quality | 40/20 |
| Surface figure | λ/4 @ 632.8 nm |
| Edge chamfer | 0.2mm × 45° |
| Material | K9/BK7 |



