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Large Diameter Quartz Pipes

Large Diameter Quartz Pipes

-- Steady & Reliable Manufacturer --

Introduction

Large Diameter Quartz Pipes are specialized tubing components characterized by outer diameters (OD) typically exceeding 200 mm and often reaching up to 500 mm or more. These pipes are fundamental to applications where large volumes of gas or liquid must be contained or reacted under conditions of high temperature, chemical corrosion, or extreme purity requirements. As a manufacturer controlling the initial draw process, Yancheng Mingyang Quartz Products Co., Ltd. ensures these pipes maintain exceptional dimensional uniformity and low OH content, crucial for minimizing light scattering and maximizing thermal stability in industrial furnaces and reactors. Due to their size, these pipes require expert handling and fabrication. We utilize specialized fusion and annealing processes to mitigate internal stress, ensuring the structural integrity is maintained across the entire large surface area and thick wall profile.

The primary markets for these large pipes include the production of polysilicon and ingots for the photovoltaic (solar) industry, the manufacture of large-area optical fibers, and the creation of large-scale chemical reactor chambers. The high cost of the final product in these fields makes the reliability of the quartz pipe an absolute necessity. Our commitment to using the highest quality fused silica ensures minimal metallic contamination (often ppb level purity), preventing yield-reducing defects in sensitive processes. We offer customization in pipe length, wall thickness, and end finishing—including grinding, polishing, and specialized tapering—to ensure perfect integration into your existing large-scale equipment. For applications requiring specific optical properties, we provide various grades, including opaque or translucent quartz, often used for uniform heat distribution in large furnace environments.

Manufacturing large diameter quartz pipes is technically challenging; maintaining roundness and avoiding defects like bubbles or inclusions requires advanced process control. Our continuous investment in large-scale quartz drawing and processing equipment allows us to reliably meet the high volume and stringent quality demands of the global solar and large-scale material processing sectors. We offer full dimensional and purity certifications with every order, standing behind the quality and performance of these mission-critical components.

Specification Parameters

ParameterDetails
Outer Diameter (OD) Range200 mm up to 600 mm (Custom large diameters available)
Wall Thickness (WT)5 mm to 15 mm (Customizable for strength/thermal profile)
Material GradeHigh Purity Fused Quartz (Synthetic, Natural, or Opaque grades)
Purity (SiO2​)Min. 99.995% (Trace elements <2 ppm)
Dimensional Tolerance (OD)Standard ±1.0 mm; Precision Ground ±0.1 mm
Max Operating Temperature1100∘C (Continuous); 1250∘C (Intermittent)
End FinishCut and Fire Polished, Precision Ground, or Flanged Fusion
Internal StressGuaranteed low internal stress post-annealing (≤5 nm/cm)

The specifications of our large diameter quartz pipes reflect the challenge of scaling up quartz manufacturing without compromising quality. The control over Internal Stress is particularly important for large pipes; if not properly annealed, the residual stress can lead to failure when the pipe is thermally cycled. We use large-capacity annealing furnaces and birefringence testing to guarantee a stress level of ≤5 nm/cm. The material grade selection is often critical in the polysilicon and solar sectors, where Opaque (Milky White) Fused Quartz is frequently specified to ensure uniform radiant heat transfer throughout the ingot growth process, preventing thermal gradients that cause crystal defects. Our precision grinding capability allows us to offer very tight tolerances on the outer diameter (±0.1 mm) for the ends, crucial for fitting into precise furnace collars or vacuum sealing assemblies. The minimum wall thickness is carefully managed to provide adequate mechanical rigidity for handling and support within the furnace structure, while maximizing the available internal volume. Every pipe undergoes visual inspection for bubbles, inclusions, and striae that could affect performance. We provide ICP-MS material purity reports confirming the trace element levels, a non-negotiable requirement for high-purity processes. We also offer specialized cleaning services to ensure the pipes are delivered ready for installation in a cleanroom environment.

Applications

  • Photovoltaic (Solar) Polysilicon Production: Used as the main reactor chamber or deposition tube for the production of high-purity polysilicon rods (Siemens process) or in FBR (Fluidized Bed Reactor) systems, where high heat and purity are required.

  • Silicon Crystal Growth: Serving as the outer chamber or support structure in large CZ (Czochralski) or FZ (Float Zone) crystal pullers for growing large-diameter silicon ingots.

  • Large-Scale Chemical Reactors: Employed as the main vessel for industrial-scale high-temperature chemical synthesis where corrosion and purity standards prevent the use of metal reactors.

  • Optical Fiber Preform Manufacturing: Used as the outer envelope tube in the MCVD (Modified Chemical Vapor Deposition) or OVD processes for drawing large glass preforms used to make communication optical fibers.

  • Industrial Sintering Furnaces: Forming the main chamber for sintering large components in protective atmospheres, benefiting from the pipe's low CTE and high thermal resistance.

  • Large-Area UV and Ozone Generators: Used as the primary containment vessel for high-output UV lamps and large-scale ozone production systems.

The unique challenge in these applications is balancing structural support with thermal performance. In solar ingot production, the large diameter pipe must withstand the massive weight of the growing silicon charge at extremely high temperatures. The low CTE of quartz is essential here to prevent cracking during the long cool-down cycle. For MCVD preform production, the pipe must maintain exceptional rotational concentricity under heat, which our precision drawing techniques guarantee. Furthermore, the chemical inertness of quartz ensures that highly corrosive halogenated gases, used in cleaning or reaction processes, do not degrade the reactor wall or contaminate the sensitive products. We partner with clients to provide custom fittings and end-caps fabricated from the same high-quality quartz, ensuring a chemically homogeneous system solution from one end to the other, guaranteeing maximum process yield.

Advantages

  • Exceptional Purity for High Yields: Near-absolute purity (ppb level) prevents process contamination, which is critical in multi-billion-dollar industries like polysilicon and advanced material manufacturing.

  • High Structural Integrity: The heavy wall and proper annealing ensure the pipe can support significant loads and withstand large temperature differences without warping or failing.

  • Superior Thermal Shock Resistance: The low CTE allows for controlled, uniform heating and cooling of large volumes without the risk of thermal fracturing, ensuring equipment longevity.

  • Choice of Optical Properties: Availability of clear, opaque (milky), or translucent grades allows clients to optimize for either pure optical transmission or uniform radiant heat distribution.

  • Unmatched Chemical Inertness: Resistance to virtually all chemical attacks maintains the integrity of the reactor over thousands of hours of service, minimizing downtime and replacement costs.

  • Global Scale and Supply Reliability: As a dedicated large-scale manufacturer, we offer consistent quality and capacity to meet the high volume demands of global industrial markets.

The investment in our large diameter quartz pipes is a direct investment in production reliability and product quality. The cost of a failed polysilicon batch or a fractured optical preform far outweighs the cost of the quartz component itself. Our pipes are manufactured to perform reliably in these high-stakes environments. Key differentiator is our ability to perform large-scale, stress-free fusion welding to attach end-plates or reducing pieces directly to the pipe, creating a fully integrated, customized vessel solution. This capability often simplifies the client's assembly process and eliminates common leak paths associated with mechanical seals. We focus on providing highly repeatable dimensional accuracy across large batches, which is non-trivial at these dimensions.

Payment and Shipping

For large capital components such as these pipes, we typically require payment via T/T (with 30−40% upfront deposit), or secured L/C (Letter of Credit) at sight, ensuring financial safety for both parties. Custom arrangements for high-volume blanket orders can include staggered payments tied to production milestones.

Shipping Protocol for Oversized Fragile Goods: Special attention is paid to the logistics of large diameter quartz pipes due to their size and fragility.

  • Engineered Crating: Each pipe is secured within custom-built, heavy-duty wooden crates designed to support the pipe's curvature and prevent rolling or shifting. Internal supports are carefully padded to distribute load evenly and absorb external shocks. Crates are IPPC compliant.

  • Monitoring: Shock sensors can be included in the packaging upon request to monitor handling during transit.

  • Freight Terms: Due to size, sea freight (FOB, CIF) is the most common method, but we can arrange specialized oversized air cargo for urgent requirements. We manage all export customs declarations and documentation to ensure efficient port clearance.

Lead times are typically 4−8 weeks for large diameter pipes depending on the required wall thickness and end-finish fabrication. Full insurance covering the replacement cost is provided standard with every shipment.

Frequently Asked Questions (FAQ)

  • Q: How do you prevent internal stress during the manufacture of such large quartz pipes?

  • A: We utilize a sophisticated, slow-cooling annealing process in large-capacity furnaces immediately after the drawing or welding phase. This thermal treatment is carefully controlled to relieve internal molecular stress, and the final result is verified using a polarimeter to ensure low birefringence and high thermal reliability (≤5 nm/cm stress).

  • Q: Can you provide large diameter pipes with an opaque (milky white) grade for furnace applications?

  • A: Yes, we specialize in high-quality opaque fused silica pipe that maximizes radiant heat transfer uniformity inside large crystal growth or CVD furnaces, preventing hot spots and cold spots that can reduce material quality and yield.

  • Q: What is the maximum length you can provide for a OD500 mm pipe?

  • A: The maximum length is determined by a balance of manufacturing capability and safe shipping logistics. We can typically provide lengths up to 2000 mm for OD500 mm pipes, but please consult with our sales team for exact current production limits and crating dimensions for international transport.

  • Q: Do you offer custom drilling or port attachments on these large pipes?

  • A: Yes, using specialized CNC and glassblowing techniques, we can custom-fabricate side ports, thermocouple wells, sight windows, or connection flanges to meet the exact requirements of your large-scale reactor design.

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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