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Heavy Wall Quartz Tubes

Heavy Wall Quartz Tubes

-- Steady & Reliable Manufacturer --

Introduction

Heavy Wall Quartz Tubes are engineered from high-purity fused silica with wall thicknesses significantly greater than standard tubing. These tubes are primarily designed for applications demanding superior mechanical strength, high-pressure containment, and exceptional structural rigidity at elevated temperatures. While retaining the core advantages of quartz—extreme purity, chemical inertness, and a low coefficient of thermal expansion (CTE)—the increased wall thickness provides dramatically improved burst strength and sag resistance. Yancheng Mingyang Quartz Products Co., Ltd. uses a specialized vertical drawing process combined with precision annealing to ensure the heavy walls maintain uniformity, minimizing internal stress and preventing localized failures under high thermal or mechanical load. The thickness is customized to meet specific pressure and temperature requirements, making these tubes indispensable in demanding industrial environments such as high-pressure UV lamp envelopes, deep-sea exploration equipment, and certain types of high-temperature chemical reactors.

The main advantage of our heavy wall tubes is their enhanced durability and safety margin. In applications involving high internal pressure or high vacuum, the wall thickness is a direct determinant of the tube's maximum safe working pressure. Our engineering team provides consultative support to help clients calculate the required wall thickness based on their operating temperature and pressure, ensuring compliance with necessary safety factors. We offer heavy wall tubing in both clear fused quartz (for optical applications) and opaque fused silica (for thermal uniformity in furnaces). Custom fabrication services are available to provide precision ground ends, flanging, or custom-drilled ports that do not compromise the tube's mechanical integrity. We control the raw material purity to ensure the low OH content required for high-temperature stability and the minimal trace element profile necessary for high-purity processes. By providing robust, high-integrity tubing, we help clients minimize downtime, enhance process safety, and increase the lifespan of their critical equipment.

Our commitment to rigorous dimensional QC and stress testing ensures that every heavy wall tube delivered is ready to perform reliably in the most challenging high-stress environments worldwide, distinguishing our product quality and reliability.

Specification Parameters

ParameterDetails
Material GradeHigh Purity Fused Quartz (Low OH Content) or Opaque Fused Silica
Outer Diameter (OD) Range20 mm up to 300 mm (Custom large diameters available)
Wall Thickness (WT) Range3.0 mm to 20.0 mm (Engineered for pressure rating)
Dimensional Tolerance (WT)Tightly controlled ±5−10% of nominal thickness
Max Working Pressure (Example)Approx. 10 MPa to 30 MPa at ambient temp (highly dependent on OD/WT)
Max Operating Temperature1100∘C (Continuous use)
Sag ResistanceSuperior resistance at high temperatures compared to standard wall tubing
End FinishPrecision Ground, Fire Polished, or Flanged (Fusion Welded)

The primary technical consideration for Heavy Wall Quartz Tubes is the calculation and verification of the Max Working Pressure. The burst pressure of a glass cylinder is inversely proportional to the radius and directly proportional to the square of the wall thickness. We use established pressure vessel formulas (like the Lamé equation) to guide the engineering of the OD to WT ratio, ensuring the tube can safely handle the client's internal pressure requirements. The controlled Dimensional Tolerance on the wall thickness is vital; any localized thin area becomes the weakest point and can lead to catastrophic failure. We use non-contact ultrasonic gauges to map the wall thickness around the circumference and length. The high Sag Resistance at 1100∘C is leveraged in horizontal furnace applications where the tube must support a heavy process load (e.g., wafer boats) over a long span without deforming, thus maintaining critical process geometry. Our annealing process is extensive for these thick components, ensuring the slow, even cooling necessary to reduce internal stress, which is magnified by the heavy wall profile. This meticulous process ensures the thermal shock resistance remains excellent, even with the added material mass.

Applications

  • High-Pressure UV Lamps: Used as the inner and outer protective envelopes for specialized UV-C and medium-pressure UV lamps operating at high internal gas pressures (e.g., 1 atm to 50 atm).

  • High-Temperature, High-Pressure Reactors: Serving as the reaction vessel for specialized chemical synthesis and material hydrothermal processes requiring both high heat and high internal pressure.

  • Semiconductor Furnace Load Tubes: Employed as structural supports and process tubes in horizontal diffusion and CVD furnaces, required to hold heavy loads of silicon wafers without sagging at temperatures up to 1200∘C.

  • Deep-Sea/Harsh Environment Sensor Housings: Used as protective pressure-vessel windows or sensor enclosures for subsea equipment and extreme environmental monitoring, where external hydrostatic pressure is immense.

  • High-Purity Inert Gas Transfer: Utilized as robust, leak-proof piping for the transfer of high-purity, high-pressure, or toxic gases in specialized manufacturing environments.

  • Plasma Torch Enclosures: Used as durable containment vessels for high-energy plasma torches and RF equipment, benefiting from both strength and dielectric properties.

The application benefit of heavy wall tubing is a direct translation of mechanical strength into process reliability and safety. In high-pressure UV lamps, a heavy wall is essential to contain the mercury vapor and withstand the high internal temperature and pressure cycling. In horizontal furnaces, the ability of the heavy wall tube to resist sag means the wafer boat's position remains stable over the long process duration, leading to uniform results and reduced yield loss. The chemical inertness of the quartz remains a key feature, ensuring that even under high pressure and temperature, the tube does not contaminate the contents. We offer custom WT and OD combinations to exactly match the mechanical interface and safety factor required by the client's equipment. For high-vacuum applications, the structural stability of the heavy wall minimizes outgassing and deformation, helping to maintain ultra-low pressures for longer periods.

Advantages

  • Exceptional Pressure Resistance: Significantly increased burst strength makes the tubes ideal for high-pressure reactors and high-intensity lamp envelopes, ensuring process safety.

  • Superior Sag and Bend Resistance: Provides high structural rigidity at elevated temperatures, essential for supporting heavy loads in long, horizontal furnace applications without deformation.

  • High Thermal Shock Endurance: The low CTE characteristic, maintained through specialized annealing, ensures the robust tube can withstand rapid temperature changes without cracking.

  • Enhanced Safety and Component Lifespan: The increased material thickness provides a generous safety margin against mechanical and thermal stress failures.

  • High Purity and Inertness: Maintains the contamination-free environment required for sensitive processes like semiconductor fabrication and high-purity chemical work.

  • Custom OD to WT Ratios: Flexibility in manufacturing to precisely match the tube’s mechanical performance to the client's specific operating pressure and temperature requirements.

The critical advantage of our heavy wall quartz tubes is the engineered safety they provide. By calculating and verifying the mechanical limits of the tubing, we offer a product that greatly reduces the risk of equipment failure in high-stakes operations. The vertical integration of our manufacturing process allows us to manage the raw quartz draw, ensuring the low internal OH and Fe content that are necessary for long-term thermal stability, a crucial factor often overlooked by standard distributors. We provide certified documentation that validates the tube's dimensions and annealing quality, giving the client full confidence in its structural performance under design load. The low CTE means the tube expands minimally when heated, maintaining a consistent interface with surrounding equipment, reducing leaks and wear.

Payment and Shipping

We accept standard international payments including T/T and L/C for bulk orders. Due to the custom, engineered nature of these tubes, a deposit is typically required upon order confirmation to initiate the specialized drawing and fabrication process.

Shipping Protocol for Heavy Tubing: The weight and dimensions of heavy wall tubes require robust crating.

  • Reinforced Crating: Tubes are secured within custom-built, heavy-duty wooden crates designed to support the tube's weight and prevent rolling or impact, especially to the precision-ground ends. Crates are IPPC certified.

  • Internal Cushioning: High-density foam inserts or engineered rubber supports are used to distribute the load evenly and absorb transportation shocks.

  • Freight: Primarily dispatched via sea freight for large, heavy orders, or specialized air cargo for urgent requirements. We manage all export logistics and provide comprehensive tracking and insurance.

Lead times for heavy wall quartz tubes are typically 4−8 weeks, depending on the complexity of the OD/WT ratio and the required end-finishing (e.g., custom flanging). Safety and quality remain our priority during delivery.

Frequently Asked Questions (FAQ)

  • Q: How does the wall thickness affect the UV transmission of the tube?

  • A: Increased wall thickness will cause a slight, but measurable, reduction in UV and visible light transmission due to the longer path length through the material. For critical optical applications, we recommend synthetic fused silica to minimize this effect, and we provide transmission data based on the final WT.

  • Q: Can heavy wall tubes be custom-drilled for ports or fittings?

  • A: Yes, we use specialized CNC diamond core drilling to create precision ports. However, holes or ports can reduce the tube's maximum pressure rating, so we only recommend this after a full engineering review of the application's pressure requirements.

  • Q: What is the benefit of using heavy wall opaque quartz tubes in a furnace?

  • A: Heavy wall opaque tubes combine the thermal uniformity benefit of the opaque material with superior structural rigidity and sag resistance. This is ideal for supporting heavy loads (e.g., large silicon ingots or wafer boats) over long spans at high temperatures.

  • Q: Do you provide a pressure rating certification for the tube?

  • A: While we cannot certify the final assembly, we provide guaranteed dimensional reports and can furnish estimated safe working pressure calculations based on the OD, WT, and material properties, allowing the client to integrate it into their system safety certification.

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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