Sapphire Tube length 50.8 mm Pressure Resistant Customized Size Single Crystal Al2O3

Sapphire Tube length 50.8 mm Pressure Resistant Customized Size Single Crystal Al2O3

 
Our Single Crystal Al₂O₃ Pressure Resistant Sapphire Tubes are engineered for extreme environments requiring high pressure resistance, optical clarity, and chemical inertness. Available in 2-inch (50.8mm) standard diameter with customizable lengths and wall thicknesses, these tubes are manufactured using premium-grade α-Al₂O₃ crystals through the Kyropoulos (KY) or Edge-defined Film-fed Growth (EFG) methods. With a burst pressure rating up to 10,000 psi (depending on wall thickness) and thermal stability from -200°C to 1,800°C, they are ideal for high-pressure viewports, semiconductor processing, and defense applications.
Key advantages over quartz or polycrystalline alumina:
✔ 3× higher mechanical strength (Flexural strength: 600-800 MPa)
✔ Superior thermal shock resistance (ΔT >500°C)
✔ Zero outgassing in vacuum/UHV environments
✔ Custom optical polishing (Ra <0.02μm) for laser-grade transparency
 

Key Features of Sapphire Tubes

 
1.Sapphire Tube Pressure Resistance

• Burst pressure: 5,000–10,000 psi (varies by WT)
• Safe working pressure: 30–50% of burst pressure
• Hydrostatic tested: Each tube certified to 1.5× working pressure
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2.Sapphire Tube Material Excellence

• Single crystal α-Al₂O₃: C-axis (0001) orientation standard
• Purity: >99.995% (4N5) with <10 defects/cm²
• Density: 3.98 g/cm³
   

3. Sapphire Tube Thermal Performance

• Max temperature: 1,800°C (inert), 1,200°C (oxidizing)
• Thermal conductivity: 35 W/m·K @25°C
• CTE: 5.3×10⁻⁶/°C (25–500°C)
   

4. Sapphire Tube Optical Clarity

• Transmission: >85% (200–5,500 nm)
• Surface finish options:
  • Standard polish: Ra <0.02μm
  • Laser-grade polish: Ra <0.005μm
     

5. Customization

• Diameter: 2" standard (50.8mm), other sizes 0.5–8"
• Wall thickness: 0.04–1.0" (1–25mm)
• Length: Up to 60" (1,500mm)
• Coatings: AR/HR/DLC available

Applications of Sapphire Tubes

 
1. High-Pressure Systems

• Oil/gas downhole sensors: Withstands >5,000 psi at 300°C
• Supercritical fluid reactors: Corrosion-resistant to CO₂/H₂S

2. Semiconductor & Vacuum

• Plasma etcher liners: Erosion-resistant for SiC/GaN processing
• MBE/UHV viewports: Zero outgassing at 10⁻¹⁰ Torr

3. Defense & Aerospace

• Missile dome prototypes: Hypervelocity impact resistant
• Deep-sea ROV lights: 10,000m pressure rating (1,100 atm)

4. Scientific Research

• Diamond anvil cell components: For >1M atm experiments
• Fusion reactor diagnostics: Neutron radiation tolerant

5. Industrial Process

• High-pressure burner tubes: For 1,500°C combustion
• Chemical injection probes: Resists HF/H₃PO₄

Specifications

FAQ
 
Q1: How does wall thickness affect pressure rating?

• 0.1" WT: ~3,000 psi working pressure
• 0.25" WT: ~7,500 psi working pressure
• 0.4" WT: ~10,000 psi burst pressure

Q2: What’s the lead time for custom sizes?

• Standard 2" tubes: 4 weeks
• Custom WT/Length: 6–8 weeks
• Coated/threaded: +2 weeks

Q3: How does sapphire compare to quartz for pressure?

 
Q4: Can sapphire tubes be repaired if cracked?
No – Single crystal sapphire cannot be welded/repaired.