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Large Diameter Quartz Tubing

Large Diameter Quartz Tubing

-- Steady & Reliable Manufacturer --

Introduction

Large Diameter Quartz Tubing refers to fused silica tubes with outer diameters typically exceeding 100 mm (4 inches) and often reaching 600 mm or more. These oversized tubes are essential components in high-volume industrial processes, particularly in the manufacture of solar cells, optical fiber preforms, and large-scale thermal processing equipment. Yancheng Mingyang Quartz Products Co., Ltd. employs specialized horizontal and vertical drawing/spinning processes to manufacture these tubes, ensuring excellent dimensional consistency, straightness, and minimal bubble content across the entire length. The high purity and exceptional thermal properties of quartz are fully leveraged in these applications, where conventional glass or metal alloys would fail due to contamination, thermal shock, or deformation at high temperatures.

In the solar photovoltaic (PV) industry, large diameter quartz tubes are used as reaction chambers or furnace liners for processes like PECVD (Plasma-Enhanced Chemical Vapor Deposition) and LPCVD (Low-Pressure CVD) of silicon nitride and polysilicon films on wafers. The uniform wall thickness and high thermal stability of our tubes guarantee consistent temperature distribution within the furnace, which is critical for achieving high cell efficiency and uniformity across large wafer batches. In the telecommunications sector, these tubes serve as the cladding material or jacket tube for the largest optical fiber preforms (used to draw millions of kilometers of fiber). The tube's internal surface quality must be pristine, and the material must be of high purity (often low-OH synthetic fused silica) to prevent defects that could compromise the final fiber's optical performance. We offer full dimensional control, including tight tolerances on the ID (Inner Diameter) and OD (Outer Diameter), and can supply tubes in lengths up to 3 meters or more, minimizing the need for complex, failure-prone joints in industrial equipment.

By supplying large diameter quartz tubing with superior dimensional and material quality, we enable high-throughput, contamination-free processing in the renewable energy and telecommunications sectors.

Specification Parameters

ParameterDetails
Outer Diameter (OD) Range100 mm to 600 mm (Custom large diameters available)
Wall Thickness2 mm to 10 mm (Controlled thickness uniformity)
LengthStandard up to 3000 mm (Custom lengths up to 4000 mm)
Material GradeNatural Fused Quartz (High Temp) or Low-OH Synthetic Fused Silica (High Purity)
Dimensional Tolerance (ID/OD)Tight ±1% on OD, critical ±0.5% on ID for internal components
Straightness/WarpHigh precision, essential for furnace roller systems
Purity/Bubble ContentControlled to ppm levels, minimal bubble count (Class A/B)
ProcessingEnd finishing, flanging, precision grinding available

The critical technical challenge for Large Diameter Quartz Tubing is maintaining Dimensional Tolerance and Wall Thickness Uniformity over very large sizes and long lengths. Our spinning and drawing processes minimize gravitational sag and ensure the ID and OD are consistent, which is paramount for both internal gas flow dynamics and fitting onto furnace support systems. For semiconductor and fiber optics, the choice of Material Grade is vital: Low-OH Synthetic Fused Silica is required for ultra-low attenuation fiber preforms or where DUV transparency is needed, while high-purity natural quartz may be sufficient for general furnace work. The Straightness/Warp specification is particularly important for tubes used in horizontal diffusion furnaces, where any deviation can cause catastrophic failure during rotation or automated wafer transfer. We perform non-contact laser measurement checks along the entire length to verify uniformity and straightness. The low Bubble Content is controlled to minimize the risk of stress fractures during thermal cycling and to maintain the tube's mechanical integrity under internal pressure or vacuum conditions. We offer custom End Finishing services, including precision grinding and flanging, to create seamless, leak-tight connections to metal flanges or other quartz components in the final assembly.

Applications

  • Semiconductor Diffusion and CVD Furnaces: Used as the large outer process tube (chamber) where silicon wafers are processed at high temperatures under controlled gas atmospheres.

  • Optical Fiber Preform Jacketing: Employed as the outer jacket tube in VAD/OVD/PCVD processes for making large telecommunication optical fiber preforms.

  • Solar Cell Processing Equipment: Serving as PECVD and LPCVD reactor chambers for depositing anti-reflective and passivation films on silicon solar cells.

  • High-Temperature Chemical Reactors: Used as durable, chemically inert reaction vessels in large-scale synthesis or materials processing industries.

  • Specialized UV Reactor Housings: Large diameter tubes act as protective sleeves for high-power UV lamps in industrial water and air treatment systems.

  • Thermal Processing Sight Windows: Large, precision-cut cross-sections of these tubes are sometimes used as thermal/pressure-resistant sight windows in large furnaces or boilers.

The application of large diameter quartz tubing is fundamentally tied to high-volume, high-value manufacturing processes. Their size allows for economies of scale, processing more product (e.g., wafers, solar cells) simultaneously. The low thermal mass and excellent thermal shock resistance of quartz allows these large tubes to be heated and cooled rapidly, improving throughput and energy efficiency compared to heavy ceramic materials. The ability to supply these tubes in long, seamless lengths significantly reduces the chance of contamination or leakage that can occur at joints or welds. Our technical team works with furnace $\text{OEM}$s to specify the optimal wall thickness to balance mechanical strength (resistance to sag under vacuum/pressure) with minimal thermal inertia. We ensure that our material meets the strict quality standards (e.g., metallic impurity limits) required for processes that are extremely sensitive to contamination.

Advantages

  • Scalability for High Volume: Large diameter allows for processing larger batches of wafers, solar cells, or optical preforms, increasing manufacturing efficiency.

  • Exceptional Thermal Performance: High working temperature (>1100∘C) and low CTE provide immunity to thermal shock and reliable stability in furnace environments.

  • Ultra-High Purity and Inertness: Prevents contamination of process materials (e.g., silicon wafers) from mobile ions or leached metallic impurities.

  • Superior Dimensional Uniformity: Advanced drawing/spinning methods ensure precise ID/OD and wall thickness over long lengths, crucial for sealing and roller systems.

  • Available in Low-OH Grade: Essential for long-length optical fiber applications to minimize IR absorption peaks.

  • Reduced Process Risk: Long, seamless tubes minimize joints, reducing potential points of leakage or stress-induced failure in high-temperature reactors.

The main advantage is delivering the unique performance of fused quartz in a large-scale format necessary for modern industrial applications. Our manufacturing process minimizes internal defects and ensures consistency, which directly translates to higher process yields for our customers. We provide the material quality required for next-generation 300 mm and 450 mm wafer processing, where tube precision is non-negotiable.

Payment and Shipping

We accept standard business payments (T/T, L/C). Due to the size and bespoke nature of large diameter tubing, volume contracts with fixed pricing and managed inventory programs are typically established for major $\text{OEM}$s.

Shipping Protocol for Large Diameter Tubing: Must prevent breakage and contamination.

  • Custom Crating: Tubes are secured in heavy-duty, reinforced wooden crates custom-built to support the entire length and protect the ends from impact.

  • Internal Bracing: Foam or non-abrasive blocks are used inside the crate to prevent movement and ensure no weight rests on the fragile tube wall.

  • Cleanliness: Tubes are capped and internally purged with inert gas or vacuum-sealed before shipment to maintain cleanliness, especially for semiconductor grades.

  • Freight: Specialized carriers are used for oversized cargo, often requiring flatbed or dedicated container shipping to minimize handling.

Lead times for large diameter tubing are 4−8 weeks, dependent on the required OD/ID and material grade (natural vs. synthetic). Custom end flanging adds an additional 1−2 weeks.

Frequently Asked Questions (FAQ)

  • Q: What is the maximum diameter quartz tube you can produce?

  • A: Our standard capacity goes up to 600 mm (∼24 inches) OD, but we can custom-fabricate or fuse sections to achieve even larger diameters for specialized one-off reactor vessels.

  • Q: How does the thickness uniformity of a large tube affect my process?

  • A: Non-uniform wall thickness leads to inconsistent heat transfer, causing radial temperature variations inside a furnace. This results in non-uniform film deposition (e.g., polysilicon) on the wafers, leading to reduced yield and cell efficiency.

  • Q: Is it possible to get a fully UV transparent large diameter tube?

  • A: Yes, we can supply UV transmitting large diameter tubes made from UV grade synthetic fused silica. This is essential for large-scale UV disinfection reactors where high UV-C transmission is required through the tube wall.

  • Q: Are your large diameter quartz tubes suitable for vacuum applications?

  • A: Yes. High-quality quartz has high compressive strength. The wall thickness is engineered to safely withstand full vacuum at high temperatures. We can supply calculations to verify the safety margin for the specific dimensions and operating conditions required.

From Made-in-China to
Global Smart Manufacturing

Yancheng Mingyang Quartz Products Co., Ltd. is a company specializing in the production of quartz and special glass products. Yancheng Mingyang Quartz Products Co., Ltd. is the production plant of Jinzhou Mingde Quartz Glass Co., Ltd. in Jiangsu, Since its establishment, the company has developed rapidly, introduced advanced technology and production equipment at home and abroad, and continuously improved and improved product quality. Relying on its own advantages, we have developed a variety of products suitable for the market and meet the needs of different customers, and solved many urgent production problems for our customers.

The company's products include quartz glass tubes, double-hole quartz glass tubes, quartz glass rods, quartz sheets, sapphire windows, calcium fluoride glass windows, infrared ultraviolet coatings, high-pressure resistant aluminosilicate glass window panels, quartz glass instruments, high borosilicate glass instruments, quartz crucibles, quartz gold-plated tubes, quartz heaters, quartz infrared heating tubes, far-infrared directional radiation heaters ultraviolet germicidal lamps and other special types of quartz glass products.

Yancheng Mingyang Quartz Products Co., Ltd.
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