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Custom Sealing-Optimized Flanged Quartz Glass Tube for Thermal Processing-TOQUARTZ®
Key Features of Flanged Quartz Glass Tube
TOQUARTZ® flanged quartz glass tubes are manufactured from high-purity quartz material, providing exceptional thermal, chemical, and optical properties required for demanding laboratory and industrial applications. Each tube undergoes rigorous quality control to ensure consistent performance in critical environments.
Heat Resistance
Withstands temperatures up to 1200°C for continuous operation, with short-term exposure tolerance up to 1450°C. The softening point of 1730°C provides significant thermal margin for high-temperature applications.
Chemical Resistance
Nearly inert to all chemicals except hydrofluoric acid, with 30 times greater acid resistance than ceramics and 150 times that of stainless steel. Maintains chemical stability even at elevated temperatures.
Precision Flange Design
Each tube features a carefully formed flange for optimal sealing and connection to other components. The precision flange provides secure, leak-tight connections critical for gas flow systems and vacuum applications.
- Nearly inert to all chemicals except hydrofluoric acid
- Rapid temperature changes without cracking
- UV spectrum transmittance＞80%
Specifications of Flanged Quartz Glass Tube
TOQUARTZ® flanged quartz glass tubes are available in various dimensions and configurations to meet specific application requirements. All specifications are verified through rigorous quality control processes to ensure consistent performance.
Material Properties
| Property | Value |
| 1. Physical Properties | |
| Material | High-purity fused quartz (≥99.99% SiO₂) |
| Density | 2.2 g/cm³ |
| Tensile Strength | ≥ 50 MPa |
| Flexural Strength | Up to 350 MPa |
| Thermal Expansion Coefficient | 5.5 × 10⁻⁷ /°C |
| 2. Thermal Conductivity | 1.3-1.4 W/(m·K) |
| Thermal Properties | |
| Maximum Operating Temperature (Continuous) | 1200℃ |
| Maximum Operating Temperature (Short-term) | 1450℃ |
| Softening Point | 1730℃ |
| Thermal Shock Resistance | Excellent (can withstand rapid temperature changes without cracking) |
| 3. Optical Properties | |
| Visible Light Transmittance | ≥ 93% |
| UV Transmittance (254 nm) | ≥ 80% |
| Refractive Index (589.3 nm) | 1.4585 |
| 4. Electrical Properties | |
| Volume Resistivity (20°C) | ≥ 10¹⁸ Ω·cm |
| Dielectric Strength | 25-40 kV/mm |
Customized Dimensions
| Model | Outer Diameter (mm) | Flange Outer Diameter (mm) | Length (mm) | SiO₂ Content (%) | Notes |
| AT-FLG-SY01 | Custom | Custom | Custom | 99.99 | One end sealed / Both ends open |
TOQUARTZ® Solving Challenges with Flanged Quartz Glass Tube
Flanged Quartz Glass Tubes for High-Temperature Laboratory Reactions
Key Advantages
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Flange sealing integrity under thermal stress
Maintains leak-free sealing after 50+ thermal cycles between 25°C and 1100°C. -
Contamination-free surface finish
Surface roughness Ra ≤ 0.4μm reduces chemical residue retention in acid vapor tests. -
Dimensional stability in acid-rich environments
<0.02% dimensional change after 72h exposure to HCl vapor at 900°C.
TOQUARTZ® solution
A German university lab previously used borosilicate tubes in acid vapor tests at 950°C, resulting in 18% failure due to flange deformation and leakage. After switching to TOQUARTZ® flanged quartz tubes, they achieved 0% leakage across 60 cycles and reduced sample contamination by 92%, enabling uninterrupted 3-week test runs.
Flanged Quartz Glass Tubes for CVD and Semiconductor Processing
Key Advantages
-
Ultra-low metal ion contamination
Al, Na, K content < 1 ppm verified by ICP-MS, ensuring semiconductor-grade purity. -
Flange flatness tolerance ≤ ±0.05mm
Ensures uniform gas flow and sealing in automated CVD chamber assemblies. -
Thermal cycling endurance > 1000 cycles
No microcrack formation after 1000x 200°C–1000°C thermal cycles (per ASTM C1525).
TOQUARTZ® solution
A Japanese semiconductor OEM faced 12% wafer yield loss due to microleaks in their CVD tubes. TOQUARTZ® delivered custom flanged tubes with flange flatness ≤0.05mm and verified impurity levels <1ppm. Yield loss dropped to <1.5%, and maintenance intervals extended from 3 to 9 months.
Flanged Quartz Glass Tubes for Industrial Heating and Processing
Key Advantages
-
Flange mechanical strength ≥ 45 MPa
Withstands 24/7 furnace operation at 1150°C without flange cracking or warping. -
Wall thickness uniformity ±0.1mm over 1.5m
Prevents thermal hotspots and ensures even heat distribution in long tube furnaces. -
Fatigue resistance under cyclic load
No structural failure after 10,000 thermal cycles (ΔT = 800°C) in simulated furnace tests.
TOQUARTZ® solution
A U.S. heat treatment equipment maker reported flange cracking in alumina tubes every 4–6 months. After adopting TOQUARTZ® flanged quartz tubes with reinforced flange geometry and ±0.1mm wall tolerance, tube lifespan increased to 18 months, reducing annual downtime by 72 hours.
TOQUARTZ® Customized Services for Flanged Quartz Glass Tube
TOQUARTZ® specializes in manufacturing custom flanged quartz tubes tailored to your specific application requirements. Our engineering team works closely with clients to develop solutions that address unique technical challenges.
Custom Design Capabilities
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Custom flange configurations
Standard, ground glass, or specialized designs for specific connection requirements -
Multi-flange designs
Tubes with multiple access points or connection flanges for complex setups -
Integrated components
Tubes with built-in baffles, sample holders, or specialized internal features -
Custom surface treatments
Fire-polished, ground, or specialized surface finishes for specific optical or sealing requirements
Customization Process
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Technical Consultation
Our engineers review your application requirements and provide technical input on optimal design. -
Design & Drawing Approval
We create detailed technical drawings for your review and approval before manufacturing. -
Prototype Development (Optional)
For complex designs, we can produce prototype samples for testing and validation. -
Production & Quality Control
Manufacturing with strict quality control procedures to ensure dimensional accuracy and material quality.
Usage Guidelines for Flanged Quartz Glass Tube
Proper handling and installation of flanged quartz glass tubes is essential for maximizing performance and extending service life. The following guidelines provide best practices for installation, operation, and maintenance.
Installation Recommendations
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Even pressure distribution:
Use appropriate gaskets (PTFE, graphite, or silicone) between the flange and mating surfaces to ensure even pressure distribution. -
Controlled tightening:
Use torque-controlled tightening in a star pattern when securing flanges to avoid stress concentration that could lead to cracking. -
Support requirements:
Provide adequate support along the tube length for horizontal installations exceeding 500mm to prevent sagging at high temperatures. -
Thermal expansion allowance:
Design mounting systems to accommodate thermal expansion during heating and cooling cycles.
Cleaning & Maintenance
-
Recommended cleaning:
Use dilute alcohol, acetone, or specialized quartz cleaners. Avoid hydrofluoric acid, which will etch and damage quartz glass. -
Deposit removal:
For stubborn deposits, hydrogen peroxide with ammonium hydroxide (SC-1 solution) can be effective for organic contaminants. -
Inspection schedule:
Regularly inspect flange surfaces for chips, cracks, or contamination that could compromise sealing integrity.
Thermal Management
-
Heating rate:
For optimal thermal shock resistance, limit heating rates to 10°C/minute for thick-walled tubes (>3mm) during the initial 20 minutes of heating. -
Temperature uniformity:
Ensure uniform heating around the tube circumference to prevent localized stress. -
Cooling considerations:
Natural cooling is recommended when possible. If forced cooling is required, ensure it is applied uniformly.
Storage Recommendations
-
Storage environment:
Store in a clean, dust-free environment with controlled humidity to prevent contamination. -
Protection:
Use protective end caps or covers to protect flange surfaces during storage and handling. -
Handling:
Always handle with clean gloves to prevent oils and contaminants from depositing on surfaces.
Ready to Discuss Your Flanged Quartz Tube Requirements?
Why Partner with TOQUARTZ
Direct Factory Advantage
As a direct manufacturer, we can cut out the numerous intermediate links.
Engineering Expertise
Technical team guides clients from material selection to design optimization, translating specs into deliverables.
Flexible Manufacturing
Handling standard & custom orders via small-batch expertise and prototyping rigor to meet urgent deadlines.
Quality
Assurance
Pre-shipment 3-step validation:
1. dimensional accuracy,
2. material purity ,
3. performance thresholds
Global Supply Chain
Reliable global logistics to industrial hubs (DE/US/JP/KR priority) with trackable milestones.
Releted Products
As a specialized manufacturer with direct factory capabilities, TOQUARTZ provides both standard and custom quartz solutions with engineering support throughout the specification and implementation process.
FAQ
Q: What are the maximum operating temperatures for flanged quartz glass tubes?
A: TOQUARTZ® flanged quartz tubes can be used continuously at temperatures up to 1200°C. For short-term applications, they can withstand temperatures up to 1450°C. The material has a softening point of approximately 1730°C, providing a significant safety margin for high-temperature applications.
Q: What is the chemical purity of TOQUARTZ® flanged quartz tubes?
A: Our standard flanged quartz tubes are manufactured using high-purity fused quartz with 99.99% SiO₂ content. Major impurities (Al, Na, K, Li, etc.) are typically in the low ppm range. For applications requiring even higher purity, we can provide detailed compositional analysis and may be able to source specialized materials with up to 99.995% SiO₂ purity.
Q: What materials are recommended for gaskets when sealing flanged quartz tubes?
A: For high-temperature applications (up to 260°C), PTFE (Teflon) gaskets are recommended. For temperatures up to 450°C, graphite gaskets work well. Specialized high-temperature silicone can be used up to 300°C. For very high temperatures (>450°C), ceramic fiber gaskets or metal C-rings with appropriate coatings may be suitable, depending on the specific application.
Q: Can flanged quartz tubes be used in vacuum applications?
A: Yes, TOQUARTZ® flanged quartz tubes are suitable for vacuum applications. With appropriate gaskets and sealing methods, they can maintain vacuum integrity down to 10⁻⁶ Torr. For ultra-high vacuum applications, specialized flange designs and preparation methods may be required. Our technical team can provide guidance on optimal configurations for vacuum systems.
Q: How do I specify the correct flange dimensions for my application?
A: For optimal sealing and compatibility, we recommend providing the following specifications: flange outer diameter, flange thickness, flange face style (flat, tapered, or ground), and any specific connection standard you’re matching to. Our technical team can assist with recommendations based on your operating conditions and connection requirements.
Contact our engineering team for technical consultation and pricing. We’ll help you select the optimal specifications for your application requirements.