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Quartz Discs

Quartz Discs

-- Steady & Reliable Manufacturer --

Introduction to Fused Quartz Discs

Fused quartz discs are fundamental components in high-tech industries, prized for their exceptional optical clarity, thermal stability, and chemical inertness. Our quartz discs are manufactured from high-purity synthetic quartz or natural quartz, tailored to meet stringent requirements for transmission in the deep UV to near-IR spectrum.

These components are critical in precision optics, instrumentation, and as protective windows in harsh environments. We offer a comprehensive range of diameters and thicknesses, with options for various surface finishes, including standard polished, optically polished, or ground finishes. The superior coefficient of thermal expansion of fused silica, incredibly low, guarantees dimensional stability even under rapid temperature changes, a feature that distinguishes it from standard glass. Our manufacturing process involves meticulous quality control, utilizing advanced slicing, grinding, and polishing techniques to achieve parallel surface flatness down to λ/10 and surface roughness measured in angstroms. This level of precision is non-negotiable for applications like high-power laser optics and semiconductor masking. Beyond standard shapes, we also manage beveling, drilling, and slotting according to complex engineering drawings, ensuring seamless integration into your high-performance systems. Our commitment is to deliver not just a disc, but a high-performance substrate that acts as a reliable window, filter, or spacer in your most critical instruments, making them an indispensable element for cutting-edge technology globally. The raw material selection is rigorous, focusing on minimal inclusions and excellent homogeneity to prevent light scattering and absorption, which is particularly vital for spectrophotometry and deep UV lithography. We understand the difference between a general-purpose disc and a high-precision optical component; our quality reflects that understanding.

Specification Details and Material Grades

The performance of a quartz disc is intrinsically linked to its material grade and detailed specifications. We utilize various grades of fused silica, including JGS1 (Synthetic Fused Silica) for superior UV transmission, JGS2 (Electric arc fusion of natural quartz) for standard applications, and JGS3 (Doped Quartz) for specialized UV cut-off or enhanced transmission bands.

Key technical parameters buyers focus on include optical properties, dimensional tolerances, and thermal resistance.

Parameter Standard Grade (JGS2) Optical Grade (JGS1) Tolerance/Remark
Purity (SiO2​ content) ≥99.99% ≥99.995% Higher purity for better UV transmission.
Thermal Expansion Coefficient 5.5×10−7/∘C 5.5×10−7/∘C Low, high thermal shock resistance.
Operating Temperature (Max) 1100∘C (Continuous) 1100∘C (Continuous) High softening point.
Diameter Tolerance ±0.1mm to ±0.5mm ±0.02mm (Precision) Depending on OD size.
Thickness Tolerance ±0.05mm ±0.01mm (High Precision) Critical for optical path length.
Surface Flatness 3λ per inch λ/10 (Custom) Measured at 632.8nm.
Surface Quality (Scratch-Dig) 80/50 20/10 (Laser Grade) As per MIL-PRF-13830B standard.
Hydroxyl Content (OH) 50−200ppm <1ppm (Low OH) Affects IR transmission characteristics.

We provide full specification documentation, including material certifications, upon request. The choice between natural and synthetic quartz fundamentally impacts the UV performance; synthetic grades are necessary for deep UV applications (below 200nm) due to their extremely low metallic impurity content. For high-energy laser applications, minimizing internal stress and maintaining excellent homogeneity across the disc's volume are crucial, which is achieved through precise annealing cycles and interferometric testing. Furthermore, the beveling specifications (typically 0.2mm×45∘) are meticulously controlled to prevent chipping during handling and mounting. It is essential for buyers to specify the exact operating wavelength range and power density, as these factors directly dictate the required surface finish and material grade, ensuring optimal performance and longevity.

Key Industrial Applications

Fused quartz discs are utilized in numerous high-stakes industrial, scientific, and commercial applications where standard glass simply cannot perform. Their combination of thermal, chemical, and optical properties makes them irreplaceable in these environments. Semiconductor Manufacturing: They are used as inspection windows, photomask substrates, and viewport covers for plasma etching and deposition chambers. The ability to withstand high temperatures and highly corrosive gases is paramount here. Optical Systems: Quartz discs serve as high-quality optical windows, beam splitters, and filter substrates in spectrophotometers, fluorescence microscopes, and high-power laser systems. The low thermal expansion ensures the optical path remains stable despite environmental fluctuations. UV Disinfection and Lighting: As end caps or protective windows for UV lamps (UVC range), quartz discs ensure maximum germicidal output transmission while protecting the lamp from environmental ingress. High-Temperature Furnaces and Reactors: They are used as viewing ports or isolation barriers in metallurgical, ceramic, and chemical processing furnaces, where temperatures can exceed 1000∘C. Aerospace and Defense: Due to their thermal shock resistance, they are ideal for protective covers on sensors and cameras in harsh, rapidly changing thermal environments. Solar/Photovoltaics: Used in high-temperature processes like diffusion, where purity is key to prevent contamination of silicon wafers. The precise parallelism and flatness of our discs ensure minimal distortion of transmitted light or view, which is particularly vital for high-resolution imaging and precise beam steering. The chemical resistance allows them to be used confidently in environments involving strong acids, halogens, and other aggressive substances, providing a durable, long-term solution. Our experience in custom cutting and polishing allows us to supply unique shapes, such as annular rings or complex multi-faceted discs, for specialized applications like flow cytometry or custom laser cavities. We work closely with R&D teams to define the correct SiO2​ grade and coating requirements (e.g., anti-reflection coatings) for optimal system performance.

Unparalleled Advantages of Our Quartz Discs

Choosing our fused quartz discs offers a distinct competitive edge, driven by our manufacturing expertise and commitment to material integrity.

  • Exceptional UV Transmission: Particularly our JGS1 grade, which offers superior transmission down to 185nm, essential for deep UV lithography and analytical instruments. This is a critical advantage over standard glass, which absorbs UV light.
  • Outstanding Thermal Shock Resistance: The extremely low coefficient of thermal expansion means our discs can withstand rapid and significant temperature fluctuations (e.g., plunging from 1000∘C to room temperature) without cracking or shattering, leading to unparalleled reliability and lifespan.
  • High Chemical Purity and Inertness: With SiO2​ content often exceeding 99.995%, our discs minimize contamination risk in sensitive processes like semiconductor etching or high-purity chemical synthesis, directly impacting end-product yield and quality.
  • Precision Dimensional Control: We consistently achieve micron-level tolerances on diameter and thickness, and optical-grade flatness (λ/10), which is non-negotiable for high-resolution optical paths and vacuum sealing applications.
  • Durability in Corrosive Environments: Fused silica resists almost all acids, including concentrated hydrochloric, nitric, and sulfuric acids, making it a highly durable material choice where plastics or metals fail.
  • Customization Flexibility: Our advanced CNC machining and laser processing capabilities allow us to produce bespoke diameters, specific edge bevels, complex holes, and specific coatings tailored precisely to customer specifications, ensuring a perfect fit and function in complex machinery.
  • Low Fluorescence/Scatter: High homogeneity and low impurity levels minimize internal light scatter and auto-fluorescence, making them ideal for sensitive fluorescence spectroscopy and high-power laser beam delivery without loss of energy or beam quality. This ensures the integrity of your light path.

We enforce a rigorous final inspection process using advanced metrology equipment to guarantee every single disc meets or exceeds the specified technical drawing, delivering peace of mind and reducing costly downtime associated with component failure.

Payment and Global Shipping Logistics

We aim to make the procurement of high-purity quartz discs a seamless and secure experience for our global clientele. Our flexible payment terms and robust logistics network are designed to accommodate the needs of diverse international buyers, from small R&D labs to large multinational corporations.

  • Accepted Payment Methods: We primarily accept T/T (Telegraphic Transfer) for bulk orders. For smaller, initial, or sample orders, PayPal or Western Union may be accepted. We can also explore L/C (Letter of Credit) for large, long-term contractual relationships, subject to mutual agreement and bank verification. A typical payment schedule is a 30% deposit upon order confirmation, with the remaining 70% balance due prior to shipment. All prices are quoted in USD unless otherwise specified.
  • Packaging Standards: Given the fragile nature and high value of optical-grade quartz, all discs are meticulously packaged. We use cleanroom-compatible packaging, including individual plastic film wraps, foam padding, and sturdy wooden crates or reinforced cartons, ensuring protection against shock, vibration, and moisture during transit.
  • Shipping Options and Carriers: We offer a range of INCOTERMS, including EXW (Ex Works), FOB (Free On Board), and CIF (Cost, Insurance, Freight). Our logistics partners include major international carriers such as DHL, FedEx, UPS, and TNT, for fast, reliable air freight. For extremely large or heavy bulk orders, sea freight options are available, though delivery times will be longer. We always provide tracking information and copies of all necessary customs and export documentation.
  • Lead Time: Standard stock items typically ship within 3-5 business days. Custom-machined or optical-grade components requiring specialized polishing and inspection may require a lead time of 2-4 weeks from the date of final drawing approval. Expedited manufacturing is often possible upon request.
  • Insurance and Claims: All international shipments are insured against loss or damage. In the rare event of transit damage, clients are advised to photograph the packaging and contents immediately upon receipt and notify us within 48 hours to facilitate a swift insurance claim and replacement process. We handle the complexity of international customs clearance documentation, striving to minimize any potential delays for the customer. We also offer options for scheduled partial shipments for clients with long-term projects to manage inventory and cash flow efficiently.

Essential Frequently Asked Questions

  • Q: What is the main difference between JGS1 and JGS2 quartz discs?

    A: The primary difference lies in the raw material and, consequently, the UV transmission performance. JGS1 (Synthetic Fused Silica) is made from synthetic precursors, resulting in extremely high purity and very low hydroxyl (OH) content. It offers excellent transmission down to approximately 185nm, making it ideal for deep UV applications. JGS2 (Natural Fused Quartz) is made from high-purity natural quartz crystal. It has higher metallic impurity levels and a higher OH content, limiting its transmission to around 220nm and above. For standard visible or IR applications, JGS2 is often more cost-effective, but JGS1 is mandatory for high-precision UV optics.

  • Q: How do I specify the required surface flatness (λ/10)?

    A: Surface flatness is a critical optical parameter, usually measured in fractions of the test light's wavelength (λ). λ/10 means the deviation from a perfectly flat surface is no more than one-tenth of the 632.8nm test wavelength. To ensure you receive this, you must explicitly state the requirement (λ/10 or 1/4λ) on your technical drawing. This level of flatness requires specialized optical polishing and interferometric testing, which adds to the cost and lead time but is essential for high-power laser windows, beam splitters, and other sensitive optical components where distortion must be minimized. Our quality control team will provide an interferogram if requested as proof of conformance.

  • Q: Can your quartz discs be used in vacuum applications?

    A: Absolutely. Fused quartz has an extremely low gas permeability and is routinely used in high-vacuum and ultra-high-vacuum (UHV) systems. Its low thermal expansion minimizes stress that could lead to leakage at the seal point. The choice of grade is important: synthetic quartz (JGS1) is often preferred for UHV because its higher purity reduces the risk of outgassing compared to some other materials. When ordering for vacuum applications, it is crucial to specify the required edge finish and tolerance, as these factors directly impact the quality of the vacuum seal (e.g., Kovar or epoxy sealing). We can provide specific preparation treatments, such as chemical cleaning, to ensure the components are ready for immediate vacuum integration. We also recommend discussing the maximum ΔT exposure in a vacuum environment to ensure the longevity of the component.

  • Q: What is the typical lifetime of a quartz disc in a T>1000∘C environment?

    A: The lifespan depends significantly on the temperature, the atmosphere, and the purity of the quartz. In clean, dry air or inert gas environments, high-purity quartz can be used continuously at temperatures up to 1100∘C for thousands of hours. However, in environments with alkali or alkaline earth metals (like Sodium or Potassium), the surface can devitrify (turn milky or crystalline) more quickly, significantly reducing its lifespan and optical quality. Using the disc above 1200∘C rapidly decreases its service life. We recommend periodic surface cleaning and inspection, and selecting the highest purity grade available for prolonged high-temperature exposure to maximize component longevity and performance.

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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