Sapphire Tube length 203.2 mm Pressure Resistant Customized Size Single Crystal Al2O3
This sapphire tube, crafted from single-crystal Al₂O₃ (99.99% purity), offers exceptional pressure resistance, thermal stability, and optical clarity, making it ideal for demanding industrial, scientific, and optical applications. With a standard length of 203.2 mm (8 inches) and customizable diameters/wall thicknesses, it is engineered to withstand extreme environments, including high-pressure chambers, corrosive fluids, and high-temperature processes. Its high transparency (80%+ from UV to mid-IR), 9 Mohs hardness, and chemical inertness ensure reliability in semiconductor equipment, laser systems, and analytical instrumentation.
Key Features of Sapphire Tubes
Single-Crystal Al₂O₃ (Sapphire): Ensures high structural integrity and minimal grain boundaries.
High Pressure Resistance: Withstands pressures exceeding 300 MPa (dependent on wall thickness).
Thermal Stability: Melting point ~2,050°C, suitable for extreme heat applications.
Optical & Mechanical Excellence
Broadband Transparency: 80%+ transmission from 200 nm (UV) to 5,500 nm (mid-IR).
Scratch & Chemical Resistance: 9 Mohs hardness, inert to most acids/alkalis (except HF).
Low Gas Permeability: Ideal for vacuum and high-purity gas systems.
Precision Engineering
Customizable Dimensions: Inner/outer diameter (ID/OD) and length tailored to application needs.
Polished Surfaces: Optional ultra-smooth (Ra <0.5 nm) or ground finishes for specific uses.
Consistency & Reliability
Crystallographic Orientation: C-axis, A-axis, or R-axis growth for specialized needs.
Low Defect Density: Minimizes optical scattering and mechanical weaknesses.
Applications of Sapphire Tubes
High-Pressure & Vacuum Systems
Pressure vessels, viewports, and sensor housings for semiconductor processing.
Supercritical fluid reactors in chemical research.
Optics & Laser Technology
Laser tube enclosures (CO₂, excimer lasers).
UV-IR optical windows and light guides.
Industrial & Analytical Instruments
Chromatography columns, gas/liquid flow cells.
Corrosion-resistant liners for harsh chemical environments.
Aerospace & Defense
Missile guidance windows, IR domes.
Radar & sensor protection in extreme conditions.
Medical & Scientific Research
MRI components, endoscopy sheaths.
Cryogenic sample holders (low thermal expansion).
Specifications
| Category | Parameter | Specification |
| Dimensions | Inner Diameter (ID) | 8.000" ±0.005" (203mm) |
| | Wall Thickness (WT) | 0.2–1.5" (5–38mm) |
| | Length (L) | 6–72" (150–1,800mm) |
| Mechanical | Burst Pressure | 2,000–5,000 psi |
| | Weibull Modulus | 15 (high reliability) |
| Thermal | Max Continuous Temp | 1,800°C (inert) |
| Optical | Transmission | 85%@200nm → 92%@4μm |
| Electrical | Volume Resistivity | >10¹⁴ Ω·cm |
FAQ
Q1: Lead time for custom 8" tubes?
- Standard: 8 weeks
- Coated/Flanged: +2 weeks
- Rush Service: 5 weeks (+30% fee)
Q2: How does cost compare to quartz?
| 8"x12"x0.5" Tube | Sapphire | Fused Quartz |
| Unit Price | $18,000 | $3,200 |
| Lifespan | 10+ years | 2–3 years |
Q3: Minimum bending radius?
- Not bendable – Single crystal must be machined to shape
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