Custom 140mm Double-Side Polished Sapphire Tubes Optical Component Protection Tubes
The "140mm double-side polished sapphire tube" refers to a tubular component approximately 140mm in length, manufactured from optical-grade sapphire (α-Al₂O₃ single crystal), with both its inner and outer walls polished.
Sapphire crystal is a critical material due to its high hardness (Mohs hardness 9, second only to diamond), excellent wear resistance, high-temperature stability (melting point ~2030-2050°C), good chemical inertness, and broad-band transmittance from UV to IR (approximately 200nm to 5500nm). "Double-side polishing" means both the inner and outer surfaces have undergone precision processing to achieve specific surface smoothness and roughness requirements, meeting the demands of high-end applications for low loss, high reliability, and precision.
Sapphire Tube Characteristic
The core advantages of such polished sapphire tubes stem from the intrinsic properties of sapphire material and precision polishing processes:
1. Extreme Hardness & Wear Resistance: Polished sapphire tubes Mohs hardness up to Level 9, making it highly resistant to scratching and wear, suitable for environments with particulates or mechanical contact.
2. Excellent Optical Properties: Good transmittance across UV, visible, and IR (200nm – 5500nm) spectra, with minimal temperature-dependent variation in IR transmittance, ideal for optical windows and transmission channels.
3. Exceptional High-Temperature Resistance & Thermal Stability: Polished sapphire tubes can withstand temperatures up to 1900°C or higher (melting point 2030-2050°C), maintaining stable physicochemical properties at high temperatures.
4. Good Chemical Stability: Polished sapphire tubes are resistant to most acids and alkalis, suitable for harsh chemical environments.
5. Advantages of Precision Polishing:
- Low Surface Roughness: Achieves extremely low surface roughness (e.g., Ra ≤ 0.1μm or lower) on both inner and outer walls, effectively reducing light scattering, adsorption, and fluid resistance.
- High Surface Finish: Minimal surface defects (scratches, digs), typically meeting specific grades of high surface quality standards (e.g., MIL-O-13810 60/40 or better).
- Good Geometric Accuracy: Precision polishing helps control concentricity, straightness, and wall thickness uniformity, ensuring consistent optical and mechanical performance.
Sapphire Tube Applications
Leveraging these properties, double-side polished sapphire tubes are used in various high-end fields:
- Semiconductor Industry: Sapphire Tube is used in high-temperature furnace tubes, viewports, wafer carriers (Boats), etc., requiring high purity, high-temperature resistance, and contamination prevention.
- Optical Instruments & Equipment: Sapphire Tube is serving as IR/UV windows, laser tubes, optical component protective tubes, spectroscopic analysis cells, etc., demanding high transmittance and low scattering loss.
- Industrial Equipment & Sensing: Applied in high-temperature/pressure viewports (e.g., chemical reactors, pumps), measurement tubes for precision flow meters, sensor protection sleeves, etc., requiring corrosion resistance, wear resistance, and stability.
- Research & Special Equipment: Sapphire Tube is utilized in optical windows for high-pressure research chambers, synchrotron radiation beamlines, special lighting devices, etc., requiring reliability under extreme conditions and providing stable optical pathways.
Sapphire Tube Parameters
The following table summarizes possible technical parameters based on common sapphire tube specifications and the 140mm dimension.
Note: Actual values may vary depending on the manufacturer, processing level, and customer requirements. The table provides estimated common ranges or typical values. Always refer to the supplier's specifications when ordering.
| Parameter Name | Description | Typical Value for 140mm Double-Side Polished Sapphire Tube (Reference) |
| Material | Optical-grade sapphire single crystal (α-Al₂O₃) | Optical-grade Sapphire Single Crystal (α-Al₂O₃) |
| Outer Diameter Range | Tube outer diameter | Customizable (e.g., several mm to hundreds of mm) |
| Outer Diameter Tolerance | Allowable deviation of outer diameter | ±0.02mm or stricter |
| Inner Diameter Range | Tube inner bore diameter | Customizable (e.g., 0.2mm to 100mm) |
| Inner Diameter Tolerance | Allowable deviation of inner bore diameter | ±0.02mm or stricter |
| Length | Tube length | ~140mm (customized) |
| Length Tolerance | Allowable deviation of length | ±0.02mm or adjusted based on length |
| Wall Thickness Deviation | Uniformity of tube wall | Consult supplier |
| Concentricity Error | Offset between inner and outer wall centers | ≤ 0.05mm (higher precision available upon request) |
| Straightness Tolerance | Axial straightness of the tube | ≤ 0.01mm/140mm or better |
| Surface Roughness (Ra) | Microscopic surface unevenness (inner/outer walls) | ≤ 0.1 μm (Ra, inner/outer walls) (higher standards achievable, e.g., Ra ≤ 0.05μm) |
| Surface Quality | Scratch/Dig Standard (e.g., MIL-O-13810) | 60/40, 40/20, or better (inner/outer walls) |
| Clear Aperture | Percentage of effective light-transmitting area | > 90% (typically ≥95%) |
More samples of Sapphire Optical Tubes
*We accept customized one, please feel free to contact us about your requirements.
About us
ZMSH is a leading enterprise dedicated to the R&D, manufacturing, precision processing, and global distribution of high-quality semiconductor substrates and optical crystal materials.
Backed by a highly skilled team of engineers and decades of management expertise, we leverage state-of-the-art fabrication facilities and rigorous inspection systems to deliver exceptional custom and non-standard component solutions. Our core strength lies in transforming innovative concepts into high-performance products tailored to specific client requirements.
Committed to the values of innovation, excellence, and customer success, ZMSH aims to set new standards in the optoelectronic materials industry and become a world-class provider of advanced crystal and semiconductor solutions.
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Q1: What are the key advantages of 140mm double-side polished sapphire tubes?
A1: They offer exceptional optical clarity (200-5500nm wavelength range), extreme surface hardness (Mohs 9), high temperature resistance (up to 1900°C), and superior chemical stability, making them ideal for demanding applications in semiconductor, optical, and high-precision industrial equipment9.
Q2: What are the typical surface specifications achieved for 140mm double-side polished sapphire tubes?
A2: They typically achieve a surface roughness of ≤0.1μm (Ra) or better and a surface quality grade of 60/40 or superior per MIL-O-13810 standards, ensuring minimal light scattering and high dimensional accuracy for precision components35.
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