Clear Fused Quartz Tubes are essential components for high-temperature industrial processes, offering unmatched purity and thermal stability. Whether used in semiconductor diffusion or laboratory furnaces, our tubes ensure reliable performance under extreme conditions.
High Purity Fused Silica for Advanced Industrial Applications
Our clear quartz tubes are manufactured from high-purity fused silica (SiO2 > 99.99%), specifically engineered for semiconductor processing, laboratory research, and high-temperature industrial environments. These tubes offer exceptional thermal stability, superior chemical resistance, and outstanding optical clarity to meet the most rigorous manufacturing standards.
Technical Highlights
- Material Purity: Available in grades from 3N to 6N. Standard inventory features SiO2 content exceeding 99.99%, ensuring ultra-low hydroxyl (OH) levels and minimal trace metal impurities.
- Thermal Performance: Capable of continuous operation at 1000°C ± 50°C, with short-term peak temperatures reaching 1300°C.
- Chemical Resistance: Highly stable against most acids, alkalis, and neutral solutions, with the exception of hydrofluoric acid and high-temperature phosphoric acid.
- Optical Properties: High transmittance across UV to near-infrared spectrums, characterized by low dispersion and an extremely low coefficient of thermal expansion.
Dimension Specifications
With a daily production capacity of 12 tons, we offer an extensive range of standard sizes and deep customization capabilities.
| Parameter | Specification Range | Tolerance |
| Outer Diameter (OD) | 0.2mm – 800mm | ±0.03mm to ±2.0mm |
| Inner Diameter (ID) | 0.06mm – 750mm | Based on OD/WT |
| Wall Thickness (WT) | 0.5mm – 10.0mm (Up to 100mm) | ±0.03mm to ±5% |
| Standard Length | 1240mm / 2000mm | Custom cutting supported |
Custom Options: We provide professional secondary processing including precision cutting, fire-polishing, centerless grinding, hole drilling, and flange welding based on your DWG or STEP files.
Material Physical Properties
- Strain Point: 1080°C
- Annealing Point: 1180°C
- Softening Point: 1630°C
- Thermal Expansion: 5.5 * 10⁻⁷ /°C (20-320°C)
- Density: 2.2 g/cm³
- Dielectric Constant: 3.74 (at 10 GHz)
Typical Industry Applications
- Semiconductor & Solar: Diffusion tubes, PECVD furnace liners, and wafer carriers.
- Laboratory Research: High-temperature reaction tubes, combustion boats, and sampling tubes.
- Water Treatment: UV sterilization lamp sleeves and protective outer jackets.
- Industrial Heating: Halogen lamp envelopes, thermocouple protection tubes, and heater sheaths.
Advanced Manufacturing Processes for Ultra-High Purity
To achieve the SiO_2 > 99.99\% purity levels required for semiconductor-grade applications, our Clear Fused Quartz Tubes undergo a proprietary purification and fusion process. We utilize high-purity natural crystal sand as raw material, processed through either electric fusion or flame fusion techniques. This ensures that metallic impurities like Al, Fe, Ca, and Na are minimized to sub-ppm levels. Furthermore, the hydroxyl (OH) content can be customized during the vacuum baking process—typically maintained below 20ppm—to ensure exceptional vacuum tightness and prevent devitrification (surface cloudiness) during prolonged exposure to temperatures above 1100^\circ C.
Precision Secondary Fabrication and Quality Assurance
As professional quartz tube suppliers, we understand that standard dimensions are often just the starting point. Our facility is equipped for high-precision secondary processing to meet specific engineering drawings. Our quality control team utilizes ultrasonic thickness gauges and laser interferometers to verify that every custom quartz tube meets the tight tolerances specified in our data tables (up to +- 0.1mm for specific OD requirements). Every batch undergoes a thermal annealing process to relieve internal stress, ensuring the tubes do not crack when subjected to high-vacuum environments or rapid thermal quenching in industrial furnaces.
Your Attractive Heading
Cleaning and Handling Procedures for Clear Fused Quartz Tubes
To maintain the high performance of Clear Fused Quartz Tubes, proper handling is critical. Surface contaminants, especially alkali metal ions from skin contact, can accelerate devitrification at high temperatures. We recommend cleaning the tubes with a 10% hydrofluoric (HF) acid solution for no more than 10 minutes, followed by a thorough rinse with deionized (DI) water. After cleaning, the tubes should be dried in a dust-free environment and handled only with clean, lint-free gloves to ensure the longevity of your custom quartz tubes.
Ready to Start Clear Fused Quartz Tubes Project?
For frequently asked questions about our products, visit our [FAQ] page for technical support.