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Quartz Rods

Quartz Rods

-- Steady & Reliable Manufacturer --

Introduction to High-Purity Fused Quartz Rods

Fused quartz rods are essential feedstock and fabricated components utilized across diverse high-temperature, high-purity, and optical applications. Distinguished by their versatility, our quartz rods are manufactured in various forms, including solid clear rods, opaque rods, and specialty ground rods. The primary material, high-purity SiO2​, imparts the critical characteristics of extremely low thermal expansion, excellent resistance to thermal shock, high chemical inertness, and superior transmission from the UV to the IR spectrum. Clear quartz rods (JGS1/JGS2) are indispensable in the lighting industry as support structures for high-intensity discharge (HID) lamps and as components in fiber optic preforms. Opaque rods, typically used when infrared heat absorption is desired, serve as heating elements or spacers in furnace designs. Furthermore, quartz rods are the raw material for complex glassworking, forming the basis for precision-machined parts, intricate lab apparatus (stirrers, supports), and specialized medical tools. We maintain tight dimensional tolerances on diameter and straightness, which is critical for their use as guides in automated machinery or as cores in fiber drawing. The structural integrity and consistency of our quartz rods ensure reliability in environments where other materials would quickly fail due to high heat or corrosive attack. We offer standard diameters from 1mm up to 100mm and lengths exceeding 2m, catering to both small-scale research applications and large-scale industrial manufacturing. Every rod undergoes meticulous quality control for bubble inclusion, striae, and surface defects, guaranteeing the highest optical and mechanical quality required by precision industries such as semiconductor manufacturing, where rods are often machined into complex carriers and supports. Our manufacturing process includes specialized fire-polishing to achieve a smooth, defect-free surface finish, enhancing their resistance to devitrification and facilitating clean handling in controlled environments, making them a foundational material for high-reliability systems globally.

Dimensional and Purity Specifications for Rod Stock

The quality of quartz rods is defined by dimensional accuracy, material grade, and freedom from internal defects, critical for both structural and optical applications.

Parameter Clear Rod (JGS2 Equivalent) Synthetic Rod (JGS1 Equivalent) Tolerance/Remark
Diameter Range 3mm to 50mm 1mm to 30mm Commonly specified for industrial use.
Diameter Tolerance ±0.1mm (Standard) ±0.02mm (Precision Ground) Critical for automated feeding/machining.
Straightness Deviation 1mm per meter 0.5mm per meter Essential for long rods used as guides/supports.
SiO2​ Purity ≥99.99% ≥99.999% High purity reduces metallic contamination.
Bubble Inclusion <0.1mm diameter (Max) Bubble-Free (Optical Grade) Prevents light scatter and structural weakness.
UV Transmission (T) ≥88% @ 254nm ≥92% @ 190nm Synthetic grade for deep UV applications.
Surface Finish Fire Polished (Standard) Optical Polish (Custom) Reduces devitrification and roughness.
OH Content 50ppm to 500ppm <10ppm (Low OH if required) Determines IR performance and viscosity.

For applications where the rod is used as a feedstock for further drawing or machining (e.g., fiber preforms or complex CNC parts), the purity and homogeneity are paramount. Synthetic quartz rods (JGS1 equivalent) are used when deep UV transparency or extremely low metallic contamination (ppb level) is required, often for UV light guides or high-purity stirred reactors. For general thermal support and lighting applications, JGS2 provides an excellent cost-performance balance. Dimensional tolerances on diameter and straightness are critical for automated feeding systems in continuous manufacturing processes. We utilize laser micrometers to ensure diameter consistency along the entire length of the rod. We offer specialized ground and polished rods where the surface finish and diameter tolerance must be held to microns, common in precision metrology and optical instrument design. Furthermore, for applications like high-temperature furnace supports, we control the OH content carefully. High OH content increases viscosity and resistance to devitrification, extending the lifespan of the rod under thermal stress. The rod form factor also simplifies subsequent processing like fusion-welding to other quartz components, provided the chemical compatibility and fusion temperature of the two materials are matched.

Diverse Applications Across Industries

Quartz rods are highly adaptable and serve critical functions across multiple high-technology sectors due to their material properties.

  • Lighting Technology:
    • Lamp Supports and Seal Structures: Providing structural integrity inside high-intensity discharge lamps (e.g., halogen, xenon) due to excellent thermal stability at extreme temperatures.
  • Fiber Optics and Telecommunications:
    • Preforms: Serving as the core or cladding rod for drawing high-purity optical fibers (especially synthetic quartz rods).
  • Semiconductor and Wafer Processing:
    • Furnace Parts: Machined into complex wafer carriers, spacers, push rods, and supports within high-temperature diffusion and epitaxy furnaces.
    • Stirrers and Agitators: Used in wet chemical etching baths due to high acid resistance.
  • Laboratory and Chemical Apparatus:
    • Stirring Rods, Spacers, and Framework: Used to construct customized glassware assemblies for high-purity chemical synthesis and analysis.
  • Industrial Heating and Sensing:
    • Infrared Emitters and Elements: Serving as core material for specific infrared heating applications.
    • Thermocouple Protection: Machined to serve as insulating sleeves or guards for temperature sensors in highly corrosive media.

In all these applications, the rod form factor is utilized either as a robust, chemically inert structural support or as a high-purity feedstock for precision fabrication. For specialized stirrers used in corrosive media, the quartz rod’s chemical inertness ensures no leaching into the high-purity reactants. For applications involving high-power laser optics, we supply rods with certified minimal scattering centers and high homogeneity to prevent beam distortion and thermal effects. Our ability to provide both standard lengths and custom cut/ground rods directly supports the rapid prototyping and volume production needs of the optical and chemical engineering industries. The combination of thermal shock resistance and minimal creep under load makes quartz rods the preferred choice for long-term structural reliability in critical temperature-controlled processes.

Functional Benefits and Manufacturing Quality

The superior quality of our fused quartz rods translates into significant performance and cost-saving benefits for the end-user.

  • Unmatched Thermal Stability: The exceptionally low coefficient of thermal expansion ensures the rods remain straight and dimensionally accurate even under rapid thermal cycling or sustained high temperatures (up to 1100∘C continuous use), eliminating warping and potential equipment damage.
  • Chemical Inertness: High purity SiO2​ resists nearly all acids and process chemicals, guaranteeing no contamination or material degradation when used as a stirrer, support, or liner in harsh chemical environments.
  • Broadband Optical Transparency: Clear quartz rods offer excellent transmission efficiency from the deep UV (190nm) through the visible and into the near-IR, making them suitable for light guides, optical assemblies, and scientific instrumentation.
  • Precision Dimensional Control: We provide rods with certified tolerance on diameter and straightness, minimizing wobble and ensuring high precision for automated feeding systems, CNC machining, and tight-tolerance component assembly.
  • Minimal Internal Defects: Rigorous quality control ensures low bubble inclusion and striae (internal stress lines), which is critical for optical applications to prevent light scatter and for structural applications to maximize mechanical strength.
  • Variety of Grades and Finishes: Availability of synthetic (JGS1) for ultimate purity and deep UV, and fire-polished natural quartz (JGS2) for cost-effective structural use, allows us to tailor the product precisely to the application's demands without over-specifying.
  • Optimal Feedstock Quality: The homogeneity and consistent fusion quality of our large-diameter rods make them ideal and efficient feedstock for subsequent drawing into complex tubing or machining into intricate structural components, minimizing material waste and processing time.

By choosing our precision-manufactured quartz rods, clients secure a foundational component known for its high-temperature resilience, chemical resistance, and uncompromising purity, ensuring product reliability and extended service life across critical industrial processes.

Ordering, Inventory, and International Shipping

We manage the logistics for quartz rods, from high-volume industrial orders to individual specialized requirements, prioritizing safety and speed.

  • Payment Terms: For standard rod stock orders, we accept Wire Transfer (T/T). For large volume or recurring OEM orders, we may negotiate Net 30/60 terms upon approved credit application. A standard 30% deposit is required for custom-ground or non-stock large-diameter rods, with the balance due before shipment. We accept payment in USD, EUR, or RMB.
  • Protective Packaging: Quartz rods are long and fragile. They are secured in custom-cut foam channels within reinforced, non-bending wooden crates or heavy-duty cardboard tubes, specifically designed to prevent lateral movement and absorb shock during transit. All long rods are shipped in certified rigid packaging with clear 'FRAGILE' warnings.
  • Shipping Options: For small, urgent orders, we use DHL/FedEx/UPS express air freight. For large industrial volumes and long rods (over 1.5m), we coordinate secure LCL (Less-than-Container Load) or FCL (Full-Container Load) sea freight under FOB or CFR terms. We work with the client's preferred logistics providers to ensure a seamless hand-off.
  • Lead Time: Common diameters and lengths of fire-polished JGS2 rods are typically available from stock, shipping within 3-5 business days. Precision-ground or synthetic JGS1 rods may require a fabrication lead time of 10-15 business days. Custom lengths and large volume orders will be quoted a specific lead time upon order confirmation.
  • Inventory Programs: We offer volume pricing and scheduled delivery programs for high-volume users, ensuring a steady, predictable supply chain and guaranteeing access to specific rod grades and dimensions with short call-off times, thereby reducing customer inventory holding costs and risk of stock-outs.

Essential Frequently Asked Questions

  • Q: What is the difference between fire-polished and ground quartz rods?

    A: Fire-polished rods have a glossy, smooth surface achieved by passing the rod through an intense flame, which melts away surface imperfections. This is common for general industrial use. Ground rods are mechanically abraded and polished, achieving a much tighter diameter tolerance (±0.02mm) and better straightness, which is essential for precision engineering, automated handling, and high-tolerance optical mounts. Ground rods are generally more expensive but offer superior dimensional control.

  • Q: Can quartz rods be easily bent or welded?

    A: Yes, quartz rods are the primary form used for quartz glassworking. They can be heated to high temperatures (approx. 1700∘C) using an O2​/H2​ torch, allowing them to be easily bent, drawn, cut, and welded to other quartz components (like tubes or plates) by a skilled glass blower. However, handling and welding high-purity quartz requires specialized, clean burners and environments to avoid introducing contaminants. We recommend using our certified welding services for critical components.

  • Q: Why is straightness a critical specification for long quartz rods?

    A: Long quartz rods are often used as guides, support rails, or push rods in automated thermal processes (like furnace loading systems) or in optical benches. If the rod is not perfectly straight, it can lead to mechanical binding, vibration, or misalignment of the components it is supporting (e.g., misalignment of wafer boats). Ensuring straightness minimizes friction and guarantees smooth, repeatable operation in high-precision machinery.

  • Q: Are opaque quartz rods suitable for high-purity chemical applications?

    A: Generally, opaque quartz is not recommended for contact with high-purity chemicals or for optical transmission applications. Opaque quartz contains microscopic air bubbles which make it opaque and slightly reduce its overall chemical resistance and purity compared to clear fused quartz. Clear quartz rods (JGS1 or JGS2) should always be used when ultra-high purity or optical transparency is required, while opaque rods are primarily used for their superior thermal properties (insulation/even heat distribution).

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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