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Sapphire Tube

Sapphire Tube

Sapphire tubes are cylindrical structures made of single crystal alumina, also known as sapphire. They are known for their excellent physical and chemical properties, such as high hardness, high temperature resistance, and chemical inertness, making them suitable for use in extreme conditions.

Sapphire tubes have various applications in industries such as aerospace, defense, electronics, and medical devices. They can be used as insulation or protective sleeves for thermocouples, heaters, and sensors operating at high temperatures. They can also be used as vacuum feedthroughs, laser components, and in high-pressure environments.

Sapphire tubes are available in different sizes and thicknesses, and can be customized according to specific requirements. They can be fabricated using various methods such as cutting, grinding, polishing, and laser machining.

Sapphire tubes are preferred over other materials due to their unique combination of properties, including high thermal conductivity, excellent optical transmission, and resistance to wear and corrosion.


Catalog No. CERAMICS
Size Customized
Material Al2O3
Purity 95% 99% 99.7%
Density 3.8~3.9 g/cm3


At CG Material, we offer high quality Sapphire Tube with exceptional purity and precision in terms of size. Our products range in diameter from 1mm to 100mm and have a purity level of up to 99.8%. We also provide custom manufacturing options for special shapes to meet specific needs.

Sapphire Tube Specifications

Item Unit Typical Values
Crystal Structure Hexagonal
Density g/cm3 3.97
Physical Properties
Poisson's Ratio 0.18~0.29
Vickers Hardness Gpa 22.5
Young's Modulus Gpa 470
Flexural Strength MPa 690
Tensile Strength Mpa 2250
Compressive Strength MPa 2940
The Thermodynamic Property
Melting Point ºC 2053
Thermal Conductivity at 20℃ W/m•k 42
CLTE 40-400℃ 10-6/℃ 7.0
Specific Heat Capacity J/(g・K) 0.75
Electrical Property
Dielectric Strength MV/m 48
Dielectric Constant at 20℃ MHz 9.3
Dielectric Loss at 20℃ MHz <1>-4
Volume Resistivity at 20℃ Ω•cm >1.0×1014
Volume Resistivity at 500℃ Ω•cm 1.0×1011
Index of Reflection
589nm No=1.768 Ne=1.760

Sapphire Tube Features

-High Strength, High Rigidity, High Anti-Abrasion, High Anti-Heat, High AntiCorrosion Characteristics, and High Anti-Plasma Characteristics.

Because of these characteristics, Single Crystal Sapphire is widely used for precision mechanical parts.

-Stable Dielectric Constant, Very Low Dielectric Loss, Good Electrical Insulation.

Single Crystal Sapphire is used as a material for substrates in super-high frequency regions. It is also used as an insulation material and microwave window. Single Crystal Sapphire has become indispensable in the Electronics Industries.

-Excellent Light Transmission.

Single Crystal Sapphire is used for various kinds of vacuum equipment, windows in reaction furnace, scanner windows and caps for optical communication due to its excellent mechanical characteristics and heat resistance.

-Good Thermal Conductivity and High Heat Resistance.

Excellent thermal conductivity at low temperatures allows Single Crystal Sapphire as a transparent material to be used in many diverse fields requiring thermal conduction and heat radiation.

Sapphire Tube Applications

(1)High Brightness LED

(2)HB-LED Semiconductor, Piezoelectric Semiconductor, Superconductor, Thin Film Substrate.

(3)MR Sensor, Precision Resistor

(4)Optical Devices

(5) Thin Film HICO

Single Crystal Sapphire is a widely used substrate material for blue, green, ultraviolet and white LEDs. It has excellent features as a base substrate for GaN deposition and great mass-productivity. In addition, it can meet future larger-size demand.

Single Crystal Sapphire is used as a base substrate in thin film deposition because its lattice alignment matches a variety of semiconductor materials combined with excellent thermal and chemical stability.



We handle our products with care to ensure they remain in their original condition during storage and transportation and to preserve their quality.



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