Web Menu

Product Search

Language

Share

High Purity Fused Quartz

High Purity Fused Quartz

-- Steady & Reliable Manufacturer --

Defining Excellence: Understanding High Purity Fused Quartz

High Purity Fused Quartz is the foundational material underpinning modern high-tech industries, representing the purest, amorphous form of silicon dioxide (SiO2​). Unlike standard fused quartz, this grade is characterized by an extremely low concentration of metallic impurities, often less than 50ppm for bulk material and sometimes down to single-digit parts per billion (ppb) for synthetic grades. This exceptional purity is crucial because it directly translates into superior optical transmission from the deep ultraviolet (UV) through the infrared (IR), and, critically, unparalleled resistance to chemical attack and high-temperature deformation. This material is primarily used in applications where contamination is a zero-tolerance issue, such as semiconductor processing, advanced optics, and high-purity chemical synthesis. We manufacture high-purity fused quartz in various forms—tubes, rods, plates, and custom-fabricated vessels—using either highly refined natural quartz sand or synthetically derived silica precursors, depending on the required level of OH content and UV performance. The manufacturing process involves melting the precursor material in an electric arc or flame, followed by meticulous annealing to relieve internal stress and ensure structural homogeneity. Our commitment to purity ensures that our components will not leach contaminants into the surrounding process, thereby preserving the integrity and yield of the final product, whether it is an integrated circuit or an optical lens. We employ sophisticated analytical techniques, including wet chemical analysis and ICP-MS, to verify purity levels on a batch-by-batch basis, providing our clients with absolute confidence in the material's composition. This high-grade material is essential for maintaining dimensional stability during rapid thermal cycling due to its inherently low coefficient of thermal expansion. Furthermore, its structural resilience and resistance to devitrification (crystallization) ensure a longer service life in harsh, corrosive, and high-temperature industrial environments. The superior purity also leads to lower internal light absorption and scatter, making it the material of choice for high-power laser optics and sensitive analytical instruments, where maximizing energy throughput is critical. We can provide documentation confirming the precise levels of key contaminants, which is a non-negotiable requirement for high-reliability military and aerospace applications.

Key Purity and Chemical Specifications

The specifications for high-purity fused quartz emphasize ultra-low contamination, specific OH content control, and high performance across the electromagnetic spectrum.

Parameter General High Purity Grade Synthetic/Optical Grade Tolerance/Remark
SiO2​ Content (Min) 100.00% 100.00% Required for high-performance applications.
Total Metallic Impurities <50ppm <20ppb (Parts per billion) Critical for semiconductor and optics.
OH (Hydroxyl) Content 50ppm to 500ppm <1ppm (Low OH) or High OH (Custom) Affects IR transmission and devitrification rate.
Thermal Expansion Coeff. 5.5×10−7/∘C 5.5×10−7/∘C Ensures dimensional stability.
UV Transmission Cut-off ∼200nm 170nm to 185nm (Deep UV) Varies significantly based on synthetic vs. natural source.
Refractive Index (nd​) 1.458 1.458 Stable and homogeneous across the material.
Specific Gravity 2.20g/cm3 2.20g/cm3 Consistent physical density.
Chemical Etch Rate Very Low (Except HF) Very Low (Acid and Halogen resistant) Crucial for resisting corrosive process gases.

The key differentiator is the control over the Hydroxyl (OH) content. High OH quartz offers better resistance to devitrification (crystallization) but absorbs infrared light (2.7μm). Low OH quartz, often used for IR applications, has a higher devitrification susceptibility but better IR transmission. Our material selection process is based entirely on the client's operational wavelength and temperature. The Total Metallic Impurities dictate the grade; synthetic quartz derived from SiCl4​ precursors achieves the highest purity (ppb level) necessary for deep UV optics and advanced semiconductor nodes. We provide detailed material specifications that include the homogeneity and inclusion count, which are vital for components used in high-power laser applications where internal defects can lead to catastrophic failure. We also work with clients to specify the appropriate annealing schedule to ensure the residual stress within the finished part is minimized, which is essential for components undergoing extreme temperature gradients. The consistency of these purity and structural specifications across large volumes is a hallmark of our high-purity manufacturing process.

Essential High-Tech Applications

High-Purity Fused Quartz is the material of choice for environments demanding maximum performance under extreme conditions and maximum protection against contamination.

  • Advanced Optics and Photonics:
    • Lenses and Prisms: Used in high-power UV and deep-UV laser systems (e.g., Excimer lasers) due to its superior UV transmission and minimal auto-fluorescence.
    • Optical Fibers and Preforms: The purest synthetic quartz rods form the core of high-bandwidth optical fibers.
  • Semiconductor Manufacturing:
    • Process Tubes and Labware: Used in thermal furnaces for doping and oxidation processes where the material must not contaminate the silicon wafer.
    • Photomask Substrates: The flatness and purity of quartz plates are foundational to the lithography process.
  • Analytical Instrumentation:
    • Cuvettes and Windows: Used in high-sensitivity spectrophotometers and mass spectrometers, where the lowest background absorption and maximum light transmission are required.
  • Aerospace and Defense:
    • Thermal Protection/Viewing Ports: Used for sensors and sight glasses due to its thermal shock resistance and stable optical properties in extreme atmospheric conditions.
  • High-Purity Chemical Processing:
    • Reaction Vessels and Stirrers: Used in the synthesis and storage of ultra-high-purity chemicals (e.g., semiconductor-grade acids) that would corrode standard metal or glass.

The high-purity grades ensure that the component is chemically passive, electrically insulating, and optically superior across a vast spectrum. Its usage is defined by its ability to reliably maintain a clean, high-performance boundary in the most complex and critical systems. The stability of the refractive index across temperature variations is also a key feature, making it suitable for precision metrology tools. Whether transmitting high-energy photons or containing corrosive reagents, this material guarantees performance integrity.

Defining Competitive Advantages of Our Purity Grades

Our advantage in high-purity fused quartz is derived from our rigorous material selection, advanced purification, and precise manufacturing control.

  • Certified Purity Levels: We provide independently verified ICP-MS certification confirming trace element concentrations in the ppb range for our synthetic grades, ensuring the material meets the strictest requirements for IC and optical manufacturing.
  • Tailored OH Content: We custom-specify OH content (low or high) based on the client's application (IR transmission vs. devitrification resistance), optimizing the material for its intended operational environment and maximizing component lifespan.
  • Superior UV Transmission: Our synthetic quartz (equivalent to JGS1) offers the industry's best deep-UV transmission (down to 170nm), making it ideal for the latest generation of UV lithography and analytical instruments.
  • Excellent Homogeneity and Stress Relief: Through proprietary annealing and melting techniques, we minimize stress birefringence and internal defects, which is crucial for high-power laser optics to prevent beam distortion and thermal lensing effects.
  • Exceptional Thermal Shock Endurance: The inherently low thermal expansion coefficient of high-purity fused quartz means our products can withstand extreme, rapid temperature changes without fracture, significantly reducing the risk of costly equipment failure.
  • Corrosion Resistance in Harsh Media: The amorphous structure and high SiO2​ concentration provide unmatched resistance to all acids (except HF), halogens, and steam, ensuring long service life in chemical and plasma processing environments.
  • Custom Fabrication Expertise: We maintain the capability to machine complex, large-scale, and high-tolerance parts—from large-diameter tubes to intricate flow cells—while preserving the material's structural integrity and purity throughout the process.

Our commitment to material science ensures that when you specify 'High Purity Fused Quartz' from us, you receive a component optimized not just for purity, but for the most demanding physical and optical performance metrics globally.

Procurement, Payment, and Specialized Logistics

Handling and shipping high-purity fused quartz requires special attention to cleanliness and fragility. Our processes are tailored to these requirements.

  • Payment Methods: We require secure international transfer, primarily T/T (Wire Transfer). For initial orders, 100% payment in advance may be required. For recurring, certified high-purity orders, we establish terms such as 30% deposit, 70% before shipment (Against Pre-Shipment Inspection Report). Due to the high value of synthetic quartz, strict adherence to financial terms is required.
  • Ultra-Clean Packaging: All components are handled in a Class 1000 cleanroom environment. After final cleaning, parts are double or triple-bagged in anti-static, low-outgassing film, sealed with a nitrogen purge, and protected by custom-cut, non-shedding foam inside robust, certified shipping containers. This ensures the purity is maintained until it reaches your cleanroom facility.
  • Shipping Protocol: The sensitivity of high-purity components often necessitates Air Freight for speed and minimal handling risk. We ship under DAP (Delivered at Place) or CIP (Carriage and Insurance Paid To) terms using specialized carriers. We emphasize comprehensive insurance to cover the full replacement cost due to the high material value.
  • Lead Time Management: Standard high-purity material forms (rods, stock plates) ship within 1 week. Custom-machined parts requiring precision polishing, special coatings, or complex welding can require 3-6 weeks from final drawing approval, depending on the required material grade and complexity.
  • Certification and Traceability: Every shipment includes a Certificate of Analysis (CoA) for material purity and a Certificate of Conformance (CoC) for dimensional specifications, ensuring easy integration into regulated manufacturing and quality systems. We maintain full traceability records for the raw material and manufacturing batch of every single component delivered.

Essential Frequently Asked Questions on Purity

  • Q: What is the biggest consequence of high OH content in fused quartz?

    A: High OH content in quartz has two primary consequences. First, it causes significant light absorption in the Near-IR region, particularly around 2.7μm, making the material unsuitable for high-fidelity IR transmission applications. Second, OH content can increase the viscosity of the quartz at high temperatures, which can influence the devitrification rate and mechanical stability of furnace components used in the 1000∘C to 1200∘C range, potentially shortening the component's service life.

  • Q: How is the purity of fused quartz verified at the ppb level?

    A: The ultra-high purity levels required for semiconductor and optical grades are verified using highly sensitive analytical techniques, primarily Inductively Coupled Plasma Mass Spectrometry (ICP-MS). A small sample of the quartz is dissolved in hydrofluoric acid and introduced into the plasma, where the ions are analyzed. ICP-MS allows for the reliable detection and quantification of metallic and trace elements down to parts per billion (ppb) or even parts per trillion (ppt) levels, providing the necessary assurance of contamination control.

  • Q: Why is synthetic quartz needed for deep UV applications?

    A: Natural quartz contains trace amounts of metallic impurities (e.g., Al,Fe) which, even in minute concentrations, cause strong absorption bands in the deep UV region (below 220nm). Synthetic fused silica is made from highly purified chemical precursors (like SiCl4​), ensuring these metallic contaminants are virtually absent. This allows synthetic quartz to transmit light efficiently down to 170nm or 185nm, which is essential for advanced UV analytical instruments and next-generation lithography systems.

  • Q: Can high-purity quartz be repaired or welded without compromising purity?

    A: Yes, high-purity quartz can be welded, but the process is highly sensitive. The welding must be performed in a cleanroom environment using high-purity H2​/O2​ or inert gas flames, and the filler material (if used) must be the same high-purity quartz grade. Standard flame welding can introduce impurities from the air or the burner tip. Our dedicated welding facilities and certified technicians ensure that the final welded joint maintains the original material's structural integrity and ultra-high purity specifications, which is critical for complex gas delivery systems.

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.
Message Feedback
High-Purity Quartz Powder High-Temperature Quartz Seals and Gaskets Quartz Tubes Quartz Rods for Fiber Optics