What is a Sapphire Tube?
Sapphire tubes, commonly referred to as synthetic sapphire pipes, sapphire cylinders, or single crystal alumina tubes, are essential components engineered for the most demanding environments. Made from extremely pure single crystal aluminum oxide, these tubes offer outstanding chemical stability alongside remarkable mechanical and thermal properties.
Sapphire Tubes vs Quartz Tubes: Why Choose Sapphire?
While quartz and other transparent glass materials are common, they frequently fail under extreme stress. Upgrading to sapphire provides unmatched advantages for your industrial and scientific projects.
- Unmatched Mechanical Strength: Sapphire boasts a hardness of 22.5 GPa, making it highly scratch resistant and far more durable than quartz.
- Superior Thermal Stability: With a maximum working temperature of 1900°C, sapphire thrives in high temperature environments where quartz would melt or deform.
- Chemical and Plasma Resistance: Sapphire is highly resistant to corrosive acids, alkalis, and plasma. This makes it the perfect material for semiconductor manufacturing chambers.
- Exceptional Optical Clarity: Sapphire offers superior light transmission across a much broader spectrum, spanning from ultraviolet to infrared wavelengths.
Sapphire Material Technical Properties
For engineers and procurement specialists evaluating materials for advanced manufacturing, here are the precise physical and chemical specifications of our single crystal alumina:
| Property | Value | Unit |
| Density | 3.97 | g/cm³ |
| Hardness | 22.5 | GPa |
| Compressive Strength | 2940 | MPa |
| Flexural Strength | 690 | MPa |
| Modulus of Elasticity | 470 | GPa |
| Max Working Temperature | 1900 | °C |
| Thermal Conductivity | 41 | W/(m·K) |
| Thermal Expansion | 5.3 x 10⁻⁶ | /°C |
| Dielectric Constant | 9.3 | @ 1 MHz |
| Volume Resistivity | 10¹⁴ | Ω·cm |
| Index of Refraction | 1.762 |
Key Features and Specifications
- High thermal conductivity combined with excellent electrical insulation.
- Low dielectric loss for high frequency electronic applications.
- Complete structural integrity with zero porosity.
- Available in multiple configurations including open tubes, closed tubes, and custom profile shapes.
Core Industry Applications
- Semiconductor Processing: Essential for plasma vacuum tubes, process gas injector nozzles, and thermowells in CVD and dry etching equipment. These tubes perfectly complement advanced sapphire wafer and silicon carbide wafer production lines.
- Testing and Analytical Instruments: The preferred choice for NMR spectroscopy, ICP MS, and precise chemical sample analysis.
- Specialized Lighting: Widely used for UV sterilization lamps, intense flashlamps, and electronic infrared countermeasures.
Frequently Asked Questions
Q1: What sizes of sapphire pipes do you offer?
We utilize advanced near net shape growth techniques to minimize machining costs. We can customize outer diameters, wall thicknesses, and lengths to your exact specifications.
Q2: Can these tubes handle high pressure environments?
Yes, the immense compressive strength of 2940 MPa allows single crystal sapphire to operate safely under extreme high pressure conditions.
Q3: Do you support global shipping?
Absolutely. Our experienced international trade team ensures secure and timely worldwide delivery for all your advanced material orders, keeping your global projects on schedule.
