Quartz Tubes Manufacturer & Custom Quartz Tube Fabrication
FGQuartz is a premier quartz tubes manufacturer specializing in ultra-high-purity fused silica tubing and bespoke quartz tube fabrication. We produce continuous-drawn standard quartz tubes alongside fully customized tubular assemblies engineered to exact CAD drawings. Our specialized geometries include precision-flanged tubes, CNC-threaded quartz tubes, multi-port gas manifolds, custom-bent routing tubes, and complex high-vacuum welded assemblies.
Leveraging over 20 years of advanced fused silica machining and thermal processing expertise, we support critical applications across the semiconductor, solar photovoltaic, fiber optic, optical, and high-temperature industrial sectors. From single R&D prototypes to scalable volume production, FGQuartz delivers exceptional dimensional control, perfect concentricity, and uncompromising material purity. Explore our full custom quartz fabrication capabilities.
Quartz Tubes Overview
FGQuartz manufactures high-performance quartz tubes tailored to withstand extreme thermal shock, corrosive chemical environments, and high mechanical stress. From standard straight cylinders to intricately machined and flame-welded process chambers, we execute specific engineering designs matched directly to your application.
We supply:
• Standard continuous-drawn quartz tubes
• Fully custom quartz tubes built to CAD prints
• Large-diameter and heavy-wall process tubes
• Precision centerless-ground tubes for tight OD/ID tolerances
Whether your process demands a simple protective sheath or a highly complex, multi-port flanged reactor assembly, our advanced fabrication facility ensures perfect mechanical execution. For complementary high-temperature components, view our quartz rods, wafer boats and custom quartz assemblies.
Typical Specifications of Quartz Tubes
The following tables outline the baseline specifications of our high-purity quartz tubes. Critical dimensions, mechanical tolerances, and wall thicknesses are fully customizable based on your OEM drawings. For complete material data, refer to our Technical Specifications.
1. Dimensional & Machining Range
| Parameter | Typical Range | Notes |
|---|---|---|
| Outer Diameter (OD) | 5 mm – 1000 mm | Large-diameter ingots and tubes available |
| Wall Thickness | 0.5 mm – 20 mm+ | Custom heavy-wall for high vacuum available |
| Length | Up to 3000 mm (standard) | Extended lengths achieved via seamless welding |
| Concentricity / Bow | Strict tolerances (e.g. < 0.1mm/m) | Controlled for automated process equipment |
2. Material Purity (Fused Silica)
| Property | Typical Value |
|---|---|
| SiO₂ Purity | ≥ 99.99% |
| Metallic Impurities | Ultra-low (Semiconductor and Fiber grades) |
| Material Type | High-purity fused silica / synthetic quartz |
| Available Optical Grades | Standard clear, UV-grade, IR-grade, Opaque |
3. Thermal & Physical Performance
| Property | Typical Value |
|---|---|
| Continuous Operating Temp. | Up to 1200 °C |
| Short-term Maximum Temp. | Up to 1300 °C |
| Softening Point | Approx. 1680 °C |
| Coefficient of Thermal Expansion | Approx. 5.5 × 10⁻⁷ /°C (Near-zero expansion) |
| Thermal Shock Resistance | Outstanding |
Note: Specifications represent typical baseline values. Custom mechanical tolerances and engineered features are verified during our engineering DFM (Design for Manufacturability) review.
Quartz Tube Types We Engineer
Below are the primary quartz tube architectures FGQuartz routinely fabricates. Whether you require raw material tubing or complex vacuum chambers, we deliver uncompromising accuracy.
Standard Quartz Tubes
We manufacture a comprehensive range of standard quartz tubes with tightly controlled outer/inner diameters and superior concentricity.
Available options include:
• Straight continuous-drawn tubes
• Large-diameter processing tubes
• Heavy-wall tubes for vacuum applications
• Ultra-thin wall tubing
Widely deployed as diffusion furnace tubes, optical fiber preform sleeves, and general high-temperature structural cylinders in semiconductor and fiber optic processes.
Flanged Quartz Tubes
Quartz tubes featuring thermally fused or CNC-machined flanges for secure equipment mounting and gas sealing.
Typical uses:
• Semiconductor process chambers
• Ultra-high vacuum (UHV) systems
• Industrial diffusion furnaces
• O-ring sealing interfaces
Flanged tubes provide a reliable mechanical interface between high-temperature quartz and metallic equipment fixtures, commonly used in semiconductor and high-temperature industrial systems.
Threaded Quartz Tubes
Quartz tubes integrated with CNC-milled threads, enabling metal-free mechanical fastening inside hot zones.
We precisely machine:
• External threading
• Internal tapping
• Custom thread profiles to OEM drawings
Threaded quartz tubes are ideal for modular systems and equipment requiring ultra-pure mechanical assemblies in high-temperature and semiconductor environments.
Quartz Tubes with Ports & Manifolds
Multi-function quartz cylinders engineered with integrated gas and fluid delivery systems.
We manufacture:
• Complex side-arm tubes
• Multi-port injection tubes
• Gas distribution manifolds
• Custom thermocouple sheaths
These structures are essential for accurate gas injection, chemical sampling, and sensor installations in LPCVD and CVD equipment within semiconductor fabs.
Bent Quartz Tubes
Quartz tubes thermally formed with controlled bends, maintaining wall thickness integrity through the curve.
Available forms:
• U-shaped radiant heater envelopes
• Precision L-shaped routing tubes
• Custom bending angles and radii
Bent quartz tubes are deployed when complex process layouts or compact equipment footprints require non-straight fluid routing in laboratory and industrial systems.
Welded Quartz Tube Assemblies
Highly complex quartz tube assemblies produced through master-level flame welding.
We provide:
• High-vacuum tube-to-tube seam welding
• Seamless tube-to-plate fusion
• Fully integrated multi-part reactor assemblies
• Post-weld stress-relief annealing
These sophisticated assemblies combine multiple geometric functions into a single, leak-proof finished component. See our full custom fabrication capabilities.
Advanced Quartz Tube Fabrication Capabilities
FGQuartz acts as a complete manufacturing partner, translating raw quartz tubing into highly technical, application-ready components. From simple length cuts to fully integrated, multi-chamber vacuum assemblies, we support OEM equipment manufacturers with uncompromising precision.
Our quartz tube fabrication processes are optimized for high-yield semiconductor, solar, optical, and rigorous laboratory environments.
Core Fabrication Capabilities:
• Precision Cutting & Edge Chamfering — Clean, chip-free diamond cutting of quartz tubes to exact lengths. Edges are frequently chamfered or fire-polished to eliminate micro-cracks and improve handling safety.
• Diamond Core Drilling — Precise CNC placement of through-holes for gas injection ports, optical sensors, and vacuum exhaust lines, preventing localized fracturing.
• CNC Milling & Slotting — Machining highly accurate locating grooves, internal steps, and positioning slots to interface seamlessly with internal support structures or wafer boats.
• Mechanical Threading — Producing precision internal and external threads directly onto quartz tubes, allowing secure, metal-free fastening in extreme-heat zones.
• Centerless Grinding & Polishing — Controlling tight OD/ID tolerances to ensure flawless concentricity. Outer and inner surfaces can be optically polished for transmission or fire-polished to prevent particle shedding.
• Thermal Tube Bending & Forming — Shaping quartz tubing via controlled thermal slumping into custom arcs, tapers, and U-bends, while actively maintaining wall thickness integrity through the curve.
• High-Vacuum Flame Welding — Utilizing oxy-hydrogen torches to seamlessly fuse quartz tubes, flanges, and side-arms. This ensures high-strength joints capable of maintaining UHV (Ultra-High Vacuum) conditions.
• Stress-Relief Annealing — All extensively machined and welded tubes undergo systematic thermal annealing to eradicate residual stress, guaranteeing long-term structural stability at 1200°C.
Whether you are designing a next-generation LPCVD chamber or simply require a modified thermocouple sheath, our engineering team can execute your CAD files (DXF, STEP, PDF) with precision. Learn more about our complete Custom Quartz Glass Fabrication.
Industry Applications of Quartz Tubes
Semiconductor
Products we supply:
• High-purity furnace diffusion tubes
• Oxidation liners and protective sheaths
• LPCVD / PECVD reactor chambers
• Flanged and multi-port injection tubes
Essential for preventing cross-contamination in critical wafer thermal processing operations. Discover more Semiconductor Quartz.
Solar PV
Products we supply:
• Large-format POCl3 diffusion tubes
• PECVD process tubes and liners
• Exhaust and gas delivery tubing
Optimized for high-throughput TOPCon, HJT, and BC solar cell manufacturing lines. Explore Solar PV Quartz.
Fiber Optics
Products we supply:
• Ultra-high purity MCVD / VAD substrate tubes
• Preform jacketing and overcladding tubes
• Custom quartz components for optical lathes
Essential for maintaining zero hydroxyl (OH) interference in fiber optic preform drawing. Discover Fiber Optic Quartz.
Laboratory & Industrial
Products we supply:
• Infrared (IR) heating element envelopes
• Custom laboratory reaction tubes
• Combustion chambers and viewing sight-glasses
• Thermocouple protective sheaths
Engineered to survive aggressive chemistry and extreme thermal shock. Discover Laboratory and High-Temperature Quartz.
Why Choose FGQuartz
• 20+ Years Legacy: Unmatched metallurgical and quartz fabrication expertise since 2005.
• End-to-End Capability: In-house CNC machining, high-vacuum flame welding, and stress-relief annealing.
• Uncompromising Material Purity: Semiconductor-grade fused silica ensuring zero process contamination.
• Agile OEM / ODM Support: From rapid-turnaround single R&D prototypes to blanket production volumes.
• Build-to-Print Precision: Manufacturing rigorously validated against your proprietary CAD drawings.
• Global Reliability: ISO 9001 certified quality control, securing supply chains for technology leaders worldwide.
Our mission is simple: If your thermal or optical process requires a specific quartz tube architecture, FGQuartz will manufacture it flawlessly. Browse our complete quartz glass products or request a quote today.
Frequently Asked Questions
Yes. We provide flange welding, side-hole drilling, bending, end-forming and fire polishing to your drawing.
Fused quartz tubes typically tolerate continuous service around 1200°C, with higher short-term limits, plus excellent thermal-shock resistance.
We fabricate large-diameter furnace tubes with outer diameters ranging from 5 mm to 1000 mm; feasible dimensions depend on specifications, so please send your required OD, ID and length for confirmation.
Clear, opaque, large-diameter, thin-wall and capillary fused quartz tubing, plus UV- and IR transmitting grades.
Ready to Source Precision Quartz Tubes?
Whether you require standard atmospheric diffusion tubes, heavy-wall vacuum chambers, CNC-threaded cylinders, or highly complex multi-port welded assemblies, FGQuartz executes your designs with precision.
Submit your CAD drawings or dimensional specifications today. Our engineering team will conduct a thorough DFM review and provide a transparent quotation, typically within 24 business hours.