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Sapphire Rod

Sapphire Rod

Sapphire rods are cylindrical structures made of single-crystal aluminum oxide (Al2O3), also known as sapphire. They are often used in industrial and scientific applications due to their high strength, hardness, and thermal stability. Sapphire rods can be produced in various sizes and shapes, ranging from a few millimeters to several centimeters in diameter and several centimeters to several meters in length.

Sapphire rods are known for their high optical clarity, making them ideal for use in optical systems and applications that require high-transparency materials. They are also highly resistant to chemical corrosion, making them suitable for use in harsh chemical environments. Sapphire rods are used in various industries, including aerospace, defense, electronics, and medical industries.

Sapphire rods can be manufactured using several methods, including the Czochralski method, the heat exchanger method, and the edge-defined film-fed growth (EFG) method. The Czochralski method involves melting a sapphire crystal and pulling a single crystal rod from the melt. The heat exchanger method involves pulling a seed crystal through a temperature gradient in a tube filled with molten sapphire. The EFG method involves drawing a seed crystal through a thin film of molten sapphire to produce a rod.

Sapphire rods can be further processed by cutting, grinding, and polishing to achieve specific shapes and surface finishes. They can also be coated with various materials to enhance their performance in specific applications.


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 Rod 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 Rod 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 Rod 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 furnaces, 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 Rod 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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