What Is a Quartz Tube Used For? Applications of High-Purity Quartz Glass Tubes in Industry
Published On: September 3, 2026
What Is a Quartz Tube Used For?
Quartz tubes — also called quartz glass tubes or fused silica tubes — are cylindrical components made from high-purity silicon dioxide (SiO₂). Thanks to their exceptional thermal resistance, chemical inertness, optical transparency and electrical insulation, quartz tubes have become indispensable across semiconductor manufacturing, photovoltaic production, laboratories, lighting and chemical processing. This article explores the main applications of quartz tubes and explains why high-purity fused silica is the material of choice for demanding industrial environments.
1. Semiconductor & Photovoltaic Furnace Processes
The most critical application of quartz tubes is in semiconductor diffusion furnaces, oxidation furnaces, annealing furnaces and LPCVD systems. In these processes, wafers must be heated to 1100°C – 1200°C in an ultra-clean atmosphere, and any metallic contamination can ruin an entire wafer batch. High-purity quartz furnace tubes act as the process chamber that isolates wafers from external impurities while withstanding extreme temperatures.
- Diffusion & Oxidation: quartz furnace tubes provide a stable, contamination-free chamber for dopant diffusion and thermal oxidation of silicon wafers.
- LPCVD & Annealing: quartz tubes resist deposition buildup and repeated thermal cycling without warping or devitrification.
- Temperature uniformity: premium quartz tubes feature uniform wall thickness, supporting ±0.5°C-level temperature control for consistent wafer-to-wafer results.
2. Thermocouple Protection (TC Tubes)
Quartz TC tubes — closed-end quartz tubes designed to protect thermocouple wires — are widely used for temperature measurement in furnaces and high-temperature reactors. The quartz sheath isolates the sensing wires from corrosive gases, molten materials and electrical interference while allowing fast, accurate thermal response.
- Compatible with K, S, R and B type thermocouples
- Withstands long-term service at 1100°C – 1200°C, up to 1450°C short-term
- Available as closed-end (blind), open-end and two-bore structures
- Prevents metal ion contamination of the furnace atmosphere
3. UV Lamps, Lasers & Optical Instruments
Quartz glass transmits light across the full spectrum from deep ultraviolet (185 nm) to infrared (2500 nm), making it the preferred envelope material for UV lamps, laser tubes and optical instruments. Ordinary glass blocks UV light, but high-purity quartz lets it pass with minimal loss.
| Application | Why Quartz Is Used |
|---|---|
| UV disinfection & water treatment lamps | High UV transmittance at 185–254 nm |
| Laser tubes & optical windows | Low optical loss, thermal shock resistance |
| Semiconductor UV lithography | Deep-UV transparency and dimensional stability |
| Infrared heating elements | Good IR transmittance and heat resistance |
4. Laboratory & Analytical Chemistry
In laboratories, quartz tubes serve as combustion tubes, reaction vessels and sample holders for high-temperature analysis. Their chemical inertness ensures that no impurities leach into samples, even when handling strong acids, alkalis or high-purity reagents.
- Combustion and pyrolysis tubes for elemental analysis
- Reaction tubes for high-temperature synthesis
- Sample boats and crucibles for thermal analysis (TGA/DTA)
- Storage of semiconductor-grade chemicals (quartz bottles & containers)
5. Chemical & Corrosive Environment Handling
Quartz is highly resistant to most acids (except hydrofluoric acid) and many corrosive gases at elevated temperatures. This makes quartz tubes and pipes ideal for guiding, spraying and containing corrosive media in chemical plants and special-process equipment.
6. Specialty Components: Boats, Flanges & Cones
Beyond standard tubes, quartz is fabricated into wafer boats, flange tubes, cones and other special-shaped components used in furnace and gas-line systems:
- Quartz boats: horizontal/vertical wafer carriers for 4", 6", 8" and 12" wafers, with precision slots (±0.1 mm) ensuring uniform gas and heat exposure.
- Quartz flange tubes: one-piece formed flange-to-tube connections for vacuum-grade semiconductor gas lines (flat, KF, CF flange options).
- Quartz cones & feeding tubes: used for precise material feeding, gas guiding and optical light concentration.
Key Properties That Make Quartz Tubes So Versatile
| Property | Typical Value |
|---|---|
| SiO₂ purity | ≥ 99.99% (up to 99.999%) |
| Long-term service temperature | 1100°C – 1200°C (short-term up to 1450°C) |
| Softening point | ≈ 1700°C |
| Thermal expansion coefficient | 5.5 * 10⁻⁷ / °C (near-zero expansion) |
| Transmittance range | 185 nm – 2500 nm (UV to IR) |
| Metal ion content | Na/K/Fe < 1 ppm |
| Available outer diameters | φ1.5 mm – φ500 mm |
How to Choose the Right Quartz Tube
Selecting the correct quartz tube depends on your process temperature, chemical environment, optical requirements and dimensional specifications. Key considerations include purity grade (99.99% vs 99.999%), wall thickness uniformity, end configurations (open, closed, flanged) and whether the tube must match existing flange or furnace interfaces. Reputable manufacturers provide one-stop custom fabrication — cutting, flame-polishing, flanging, sealing and frosting — to meet exact drawings.
Conclusion
From semiconductor furnaces to UV disinfection systems and laboratory analysis, quartz tubes deliver a unique combination of heat resistance, purity, transparency and chemical stability that few other materials can match. Understanding what a quartz tube is used for — and specifying the right purity and dimensions — is the first step toward reliable, high-yield industrial processes.
If you are evaluating quartz tubes for your application, contact Jiangsu Xiangtong Quartz Technology Co., Ltd. for expert guidance and custom solutions at www.quartzglass-tube.com.
