EFG Grown Method Sapphire Tube Customizable Sizes with Wide Transmission Wavelength Range
Why choose Sapphire ?
Sapphire, as a high-performance optical and structural material, has a wide range of applications in science, industry, and defense. In modern engineering, sapphire crystals are commonly used in plate, rod, tube, or complex shapes. However, during the machining of sapphire to achieve the desired geometry, not only is there significant loss of expensive raw materials, but the process is also extremely time-consuming, since sapphire can only be machined using diamond tools at very low speeds.
The emergence of the Edge-Defined Film-Fed Growth (EFG) technique has fundamentally changed this situation. After more than 50 years of development and refinement, the EFG method now enables the direct growth of sapphire crystals with specific shapes and dimensions, greatly reducing or even eliminating the need for additional machining. Furthermore, EFG offers several major advantages, including high crystal growth rate, the ability to grow multiple crystals simultaneously, and high production efficiency.
The Introduction and Advantages of EFG Method Sapphire:
The growth principle of the EFG (Edge-Defined Film-Fed Growth) crystal is as follows:
Through the capillary action of small pores or slits within the die (mold), the molten material in the crucible is drawn upward to the upper surface of the die, which is wettable by the melt. On the top surface of the die, crystal growth is initiated and guided by a seed crystal in a controlled orientation. The cross-sectional shape of the grown crystal is determined by the shape of the die’s upper surface.
Sapphire possesses unique physical and chemical properties—such as a high melting point, high hardness, broad optical transmission range, radiation resistance, and chemical corrosion resistance—which make it widely used in various engineering and technological fields. However, due to its extreme hardness, sapphire is difficult to machine into desired shapes and dimensions, and it is also challenging to grow large-sized sapphire crystals. The Edge-Defined Film-Fed Growth (EFG) method effectively addresses these issues. Simultaneous multi-crystal growth to reduce production costs, Growth of complex-shaped and large-size sapphire crystals, and Improvement of structural integrity and crystal quality of EFG-grown sapphire.
The Advantages and Specifications of ZMSH Sapphire Tubes:
Extreme Hardness: Second only to diamond on the Mohs hardness scale, making them highly scratch-resistant.
High-Temperature Resistance: Can withstand temperatures exceeding 2,000°C without significant degradation.
Chemical Inertness: Resistant to acids, alkalis, and most corrosive environments.
Optical Transparency: Offers high transmission from ultraviolet (UV) to infrared (IR) wavelengths, making it useful in optics.
High Strength and Durability: Maintains structural integrity under extreme pressure and stress.
Excellent Electrical Insulation: Used in electrical and semiconductor industries.
| Features | Description |
| Chemical Formula | Al₂O₃ (aluminum oxide) |
| Hardness | 9 Moh's |
| Class | Hexagonal-scalenohedral |
| Melting Point | 2053°C (3727°F) |
| Maximum Useful Temperature | 2000°C |
| Surface Quality | 80/50, 60/40, 40/20, 20/10 (Scratch/Dig) |
| Axis Orientation | C-Axis (C-Plane), M-Plane, A-Plane, R-Plane and Random |
| Young's Modulus | 435 GPa |
| Tensile Strength | 275 MPa to 400 MPa |
| Flexural Strength | 480 MPa to 895 MPa |
| Modulus of Rigidity | 175 GPa |
| Density | 3.97 g/cm³ |
| Transmission Range | 190nm to 5 microns |
| Poisson's Ratio | 0.27 - 0.30 |
| Abbe Number (νd) | 72.24 |
| Dimension Tolerance | ± 0.1mm |
| Thickness Tolerance | ± 0.01-0.10mm |
ZMSH Related Product Recommendation:
Transparent Sapphire Tube (KY Grown), 20×16×60 mm, High Hardness & Wear Resistance
Q&A:
Q: what is a sapphire tube?
A: A sapphire tube is a hollow cylindrical component made from single-crystal aluminum oxide (Al₂O₃) — the same material as sapphire gemstones, but grown synthetically for industrial and scientific use. Because of its exceptional hardness, transparency, chemical resistance, and thermal stability, a sapphire tube is used in optical, mechanical, and high-temperature applications where traditional glass or quartz tubes would fail.
Q: Is sapphire a single crystal?
A: Sapphire, commonly known for the gemstone of the same name, is a single crystal alumina that creates a high-purity, high-performance material. Due to its excellent mechanical properties and chemical stability, it is applied to both mechanical and precision parts.
Q: What’s the difference between EFG and Ky sapphire tubes?
A: EFG tubes are grown directly into tubular shapes, offering cost efficiency and long lengths. Ky tubes are machined from boules, offering better crystal consistency and are preferred for precision-demanding applications.
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EFG Grown Method Sapphire Tube Customizable Sizes with Wide Transmission Wavelength Range Images
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