Unpolished Sapphire Rod Single Crystal Al₂O₃ Optical & Industrial Components
Product Overview:
High-purity single crystal sapphire rods (Al₂O₃, 99.999%) are engineered for advanced optical, semiconductor, and industrial applications requiring exceptional hardness, thermal endurance, and chemical stability. Produced through the Kyropoulos (KY) or Pulling-Down (PD) methods, these sapphire rods feature uniform lattice orientation, high precision, and excellent mechanical integrity.
With outstanding optical transmission from UV to IR, high wear resistance, and the ability to operate continuously in environments exceeding 2000°C, sapphire rods are widely used in optical instruments, semiconductor equipment, LED manufacturing, high-temperature furnaces, laser systems, and precision mechanical components.
Custom diameters (down to 0.3 mm), lengths (up to 600 mm), and crystal orientations are available to meet specialized engineering, research, and industrial requirements.
Key Features
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Ultra-high purity monocrystalline Al₂O₃ (99.999%)
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Mohs hardness 9 — extremely wear-resistant and scratch-resistant
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Thermal stability up to 2000°C with low thermal deformation
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Excellent optical transparency (0.17–5.5 μm, UV–IR)
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Chemical & plasma resistance against acids, alkalis, molten metals, gases
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High dielectric strength for electronic and RF applications
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Customizable in size, orientation, finishing, and geometry
Technical Specifications
| Item | Specification |
| Material | 99.999% High-Purity Monocrystalline Al₂O₃ |
| Crystal Orientation | C-plane (0001), A-plane (11-20), M-plane (10-10), R-plane (1-102), N-plane (11-23), V-plane (22-43) |
| Diameter | 0.3 mm – 8 inch (custom) |
| Length | Up to 600 mm |
| Density | 3.97–4.1 g/cm³ |
| Melting Point | 2000–2050°C |
| Surface Finish | Unpolished / Polished |
| Coefficient of Thermal Expansion | 5.0–8.4 × 10⁻⁶ /K |
| Optical Transmission Range | 0.17–5.5 μm |
| Refractive Index (0.532 μm) | n₀ = 1.7717, nₑ = 1.76355 |
| Crystal Structure | Hexagonal (Rhombohedral) |
| Hardness | Mohs 9 |
| Young’s Modulus | 345 GPa |
| Shear Modulus | 145 GPa |
| Bulk Modulus | 240 GPa |
| Water Absorption | Nil |
| Packaging | Single-piece protection packaging |
Applications
Semiconductor & Electronics
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Wafer support rods
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High-temperature furnace rods
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MOCVD/LED support components
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Plasma-resistant fixtures
Optical & Photonics
Industrial & Mechanical
Medical & Scientific
Custom Options
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Diameter: 0.3 mm – 8”
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Length: 5 mm – 600 mm
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Crystal orientation (C/A/M/R/N/V)
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End shape: flat / rounded / tapered / saddle pin
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Surface: fine-ground / single-side or double-side polished
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OEM & engineering support available
FAQ
1. What makes sapphire rods suitable for high-temperature applications?
Sapphire maintains crystal integrity up to 2000°C, offering low thermal expansion, high strength, and chemical inertness under extreme heat.
2. Are sapphire rods resistant to corrosion and plasma?
Yes. Sapphire is inert to acids, alkalis, plasma, and most molten metals, making it ideal for semiconductor chambers and harsh-chemistry environments.
3. Can sapphire rods be customized?
Yes. Custom diameters, lengths, polished surfaces, crystal orientations, and complex shapes are available to meet optical, semiconductor, and mechanical requirements.
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Unpolished Sapphire Rod Single Crystal Al₂O₃ Optical & Industrial Components Images
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