Donghai County Nivra Quartz Products Co., Ltd. manufactures high-purity single crystal Al₂O₃ synthetic sapphire plates, discs, and viewports. Sapphire represents one of the hardest oxide crystals, standing second only to diamond. Its structural density and extreme thermal thresholds make it the premier choice for applications where ordinary fused quartz or borosilicate cannot survive abrasive wear, mechanical pressure, or severe chemical corrosion.
| Chemical Formula & Structure | Single Crystal Corundum (Al₂O₃ > 99.99%) / Hexagonal |
|---|---|
| Hardness | Mohs 9 / Knoop Hardness 2000–2200 kg/mm² |
| Optical Transmission Range | 190 nm to 4500 nm (Deep UV, Visible, Mid-Infrared) |
| Melting Point & Thermal Limit | Melting point 2040 °C / Service temperature up to 1800 °C |
| Thermal Conductivity | 40 W/(m·K) at 20 °C |
| Surface Roughness (Ra) | Ra < 0.5 nm (Precision Double-Sided Polishing) |
| Available Dimensional Tolerances | Diameter/Width: ±0.02 mm; Thickness: ±0.01 mm; Parallelism < 10 arcsec |
Mohs 9 hardness ensures surfaces remain completely impervious to airborne sands, steel blades, and harsh abrasive contact environments.
Offers uniform transmission from ultraviolet through mid-wave infrared wavelengths, making it optimal for spectroscopy and thermal sensors.
Features compressive strength over 2,000 MPa, withstanding deep-sea submersion, hyperbaric chambers, and explosive pressure viewports.
Options include step edges, drill holes, laser etching, metallization, anti-reflective (AR) coatings, and hydrophobic surface treatments.
Send your engineering drawings (PDF, CAD, DWG) directly to our technical team for immediate review.