Clear Fused Silica Quartz Glass Tube Blank
Raw stock transparent pipe blank for glassblowing workshops, hot bending, thermal furnace sleeves, and industrial diffusion liners.
Precision Portfolio
High-Purity Quartz Glass Sheets & Substrates
Manufactured from ultra-pure natural crystal sands and synthetic silica precursors (≤20 ppm total metallic impurities). Available in custom thicknesses (0.3 mm to 50 mm), bespoke geometries, optical ground-and-polished finishes (Ra < 0.5 nm), and tight parallel tolerances.
Quartz Substrate Plate for Semiconductor Fused Silica
Double-side clear-polished optical fused silica substrates designed for microfabrication, CMP wafer polishing carriers, and lithography.
High-Purity Semiconductor Quartz Plate Substrate
Custom thermal-shock resistant fused silica substrate plate exhibiting extreme electrical resistivity and minimal trace metal content (≤15 ppm).
Quartz Viewport Glass Plate Vacuum Chamber Window
High-pressure and ultra-high vacuum (UHV) viewport flanges with high broadband transmission across deep ultraviolet to near infrared spectra.
Ultra-Thin Quartz Plate 0.3mm 0.5mm Optical Grade
Precision-lapped ultra-thin fused silica sheets down to 0.2mm/0.3mm with surface roughness Ra ≤ 0.5nm for biochips, MEMS, and laser coverslips.
Polished Quartz Plate with Precision Center Hole
Ultrasonic-core drilled and chamfered fused silica disc plate tailored for optical encoders, heating lamp bases, and vacuum gas delivery ports.
CNC-Machined Complex-Shape Quartz Plate
5-axis CNC profiled quartz sheets with intricate step slots, counterbores, beveled edge arrays, and fire-polished edges for plasma etch chambers.
Round Quartz Plate Disc Fused Silica Clear Polished
Circular fused quartz discs and sight glasses cut to custom diameter (Ø10 mm to 600 mm) with beveling, optical anti-reflective coating, and laser etching.
Industry Whitepaper Deep-Dive
Engineering High-Purity Fused Quartz Glass Sheets: Structural Excellence & Material Purity
Quartz glass sheets—often referred to interchangeably in industrial engineering contexts as fused quartz plates, fused silica substrates, or vitreous silica windows—constitute a mission-critical class of dielectric and optical materials. Fabricated by converting high-purity crystalline silicon dioxide (SiO&sub2;) through electrical vacuum fusion, oxy-hydrogen flame fusion, or chemical vapor synthesis into an amorphous cross-linked silicon-oxygen tetrahedron network, these sheets possess a virtually unmatched combination of extreme thermal shock resistance, wide spectral optical transmission spanning from 190 nm (Deep UV) to 3,500 nm (Near Infrared), exceptionally high electrical breakdown strength, and near-absolute chemical inertness.
As semiconductor wafer fabrication migrates below 3 nm sub-nodes, high-density packaging architectures (2.5D/3D chiplets) accelerate, and high-fluence laser processing tools expand into industrial gigafactories, procurement engineers face stringent specifications regarding bubbled inclusions, metallic contamination, optical wave-front distortion, and micro-roughness. At VEZLO Quartz Products Co., Ltd., based in Donghai County—recognized globally as "China's Quartz Center"—we manage a vertically integrated manufacturing ecosystem covering raw high-purity quartz (HPQ) refining, ingot fusion, precision wire-saw slicing, double-sided optical lapping, CNC ultrasonic profile machining, and cleanroom vacuum annealing.
| Physical / Dielectric Property | Fused Quartz Sheet (JGS2/3) | Synthetic Fused Silica (JGS1) |
|---|---|---|
| SiO&sub2; Chemical Purity | ≥ 99.99% (≤20 ppm metals) | ≥ 99.9999% (≤0.5 ppm metals) |
| Density at 20°C | 2.20 g/cm³ | 2.201 g/cm³ |
| Thermal Expansion Coeff. (0–300°C) | 5.5 × 10−7 /°C | 5.2 × 10−7 /°C |
| Max Continuous Service Temperature | 1,100 °C | 1,150 °C |
| Short-Term Peak Softening Point | 1,683 °C | 1,730 °C |
| Dielectric Constant (ε) at 1 MHz | 3.75 | 3.80 |
| Dielectric Loss Factor (tan δ) at 1 MHz | < 1.0 × 10−4 | < 4.0 × 10−5 |
| Transmittance Window Range | 260 nm – 2,500 nm | 185 nm – 2,100 nm (DUV Grade) |
| Surface Roughness Capability (Ra) | ≤ 0.8 nm | ≤ 0.3 nm (Super-Polished) |
Technical Sourcing Checklist for Quartz Sheets
Avoid procurement delays and costly machining scrap by detailing the following six critical criteria when issuing RFQs for custom quartz plates:
- Spectral Class & Hydroxyl (OH) Content: State whether your process requires DUV (Far-UV, OH > 800-1200 ppm for excimer laser transparency) or IR-grade (OH < 5-20 ppm to prevent absorption bands at 2.72 μm).
- Surface Quality Standard: Define scratch-dig tolerances per MIL-PRF-13830B (e.g., 60/40 for sight viewports; 20/10 or 10/5 for semiconductor mask blanks).
- Geometric Parallelism & Flatness: Indicate total thickness variation (TTV < 2 μm), wedge angles (≤ 30 arcsec), and transmitted wavefront error (λ/4 or λ/10).
- Edge Finishing & Beveling: Standard ground, C-ground, full radius, or fire-polished edges to mitigate micro-cracking during extreme thermal cycles.
- Operating Thermal & Plasma Stress: Continuous thermal exposure ratings, rapid thermal cycling rates (ΔT > 1,000°C quenching), and exposure to aggressive CF&sub4;/CHF&sub3; dry etching plasmas.
Market Intelligence & Forecasting
Future Procurement Trends in Quartz Glass Sheets (2025–2035)
How front-end semiconductor fabrication, advanced packaging, optical clean energy, and quantum sensing are transforming global fused silica supply chain strategies.
Sub-2nm Lithography Mask Blanks & Pellicles
Advanced semiconductor nodes demand synthetic fused silica sheets with near-zero thermal expansion variation (< 5 ppb/K), virtually zero striae, and sub-surface damage-free polishing to eliminate phase errors under high-power EUV and high-NA immersion DUV lithography systems.
Ultra-Thin Substrates for 2.5D/3D Chiplet Carriers
Packaging foundries are migrating from standard borosilicate to precision ultra-thin fused quartz glass sheets (0.2 mm – 0.5 mm). Quartz exhibits superior dimensional stability at temperatures exceeding 450°C, offering coefficient of thermal expansion (CTE) matching to silicon during Temporary Wafer Bonding (TWB) and debonding processes.
Next-Gen High-Capacity Solar (TOPCon & Perovskite Tandem)
Solar cell manufacturing lines are scaling up furnace sizes for n-type TOPCon and perovskite-silicon tandem cells. Procuring oversized quartz windows, diffusion furnace shelves, and paddle plates capable of withstanding corrosive POCl&sub3; and BBr&sub3; atmospheres has become a critical supply-chain hedging strategy.
Supply Chain Reshoring & Upstream Sand Security
Global original equipment manufacturers (OEMs) are seeking qualified secondary sources outside single-source monopolies. Having certified access to the high-purity natural silica sand basin in Donghai allows VEZLO Quartz to guarantee material provenance, chemical purity traceability, and lead-time stability.
Plasma Etch Chamber Armor with Extended Lifetime
In high-density plasma (ICP/CCP) etch tools utilizing fluorine and chlorine chemistries, quartz sheets act as chamber liners and dielectric windows. Trends point toward flame-annealed quartz sheets with optimized crystalline boundary conditions to reduce micro-arcing and particle flaking.
Monolithic Microfluidic Bio-Diagnostic Chips
Biomedical flow cytometry and DNA sequencing instruments require high optical transmission down to 260 nm coupled with near-zero background autofluorescence. CNC-machined and laser-ablated quartz microfluidic plates provide chemical inertness across the entire pH spectrum (except HF).
Manufacturing Innovation
Technological Frontiers in Quartz Glass Fabrication
Pioneering fabrication paradigms enabling sub-nanometer surface planarization, complex monolithic geometries, and low-loss dielectric performance.
Ultrasonic 5-Axis Precision Machining
Conventional diamond grinding of brittle vitreous quartz frequently introduces subsurface micro-fissures and edge chip-outs. VEZLO integrates 20–40 kHz ultrasonic-assisted milling heads, drastically reducing cutting forces by 40–60% and enabling intricate internal cutouts, wafer handling steps, and micro-grooves with tolerances within ±0.01 mm.
Magnetorheological Finishing (MRF) for Ra < 0.3 nm
Deterministic polishing employing magnetorheological finishing fluids and pitch-polishing eliminates subsurface damage (SSD). This achieves atomic-level flatness (λ/20) and surface micro-roughness below 3 Angstroms (Ra < 0.3 nm), critical for high-damage-threshold laser optics and laser gyroscopes.
Low-Stress Dynamic Thermal Annealing Protocols
Through computerized multi-stage electric vacuum annealing furnaces, quartz plates are heated through their annealing point (~1,215°C) with slow, programmed ramp-downs. This relieves internal frozen-in mechanical stresses, lowering optical birefringence below 5 nm/cm for high-precision polarization optics.
Quality Assurance Architecture
Defect Metrology & Quality Control Systems
Ensuring zero critical failures in ultra-clean, high-temperature, and vacuum operational environments.
Laser Scatter Inclusions & Airline Detection
Every quartz sheet undergoes cross-polarized laser scattering metrology to scan for internal gaseous bubbles, micro-inclusions, and elongated airlines. VEZLO classifies products strictly per ISO 10110-3, ensuring zero bubbles > 0.1 mm in active optical zones.
Dual-Beam UV-VIS-NIR Spectrophotometry
Transmission profiles are verified across the entire spectrum (190 nm to 3,200 nm). We ensure consistent transmittance (> 90% at 254 nm germicidal bands for JGS2, and > 92% at 193 nm for JGS1 DUV grades) with certified spectrophotometer test curves included in every batch.
Interferometric Flatness & TTV Mapping
Zygo phase-shifting laser interferometers verify transmitted wavefront distortion, peak-to-valley (P-V) flatness, and total thickness variation across sheets up to 600 mm diameter, guaranteeing seamless hermetic sealing in high-vacuum chamber viewports.
Why VEZLO Quartz
Vertically Integrated Manufacturing Excellence in Donghai, China
Operating from a 50-mu (≈33,000 m²) modern production base in Donghai County—the epicenter of China's quartz crystal resources—VEZLO Quartz Products Co., Ltd. combines raw material refining, electric and gas fusion, precision CNC cold machining, and strict cleanroom metrology.
Raw Material Security
Direct access to Donghai high-purity silica sand reserves with automated magnetic separation, acid washing, and thermal cracking (≤20 ppm total metallic impurities).
Provincial & National R&D
Developers of the 320 mm high-purity quartz tube for Jiangsu Science & Technology Support Project, and the 520 mm semiconductor diffusion furnace tube reviewed for national new products.
Fast Engineering Response
Experienced bilingual CAD/DFM engineering team providing comprehensive technical quotation reviews and feasibility reports within an average of ≤2 hours.
Export Packing & Logistics
Over 50% repeat order rate backed by multi-layer anti-shock pearl foam packaging, vacuum sealing, and export-compliant fumigation-free wooden crates for global sea, air, and courier transport.
Procurement Knowledge Base
Frequently Asked Questions (FAQ) on Quartz Sheets
Clear, engineering-backed answers addressing the most common questions regarding fused quartz and synthetic fused silica procurement.
What are the primary differences between Fused Quartz and Synthetic Fused Silica sheets? +
Fused quartz is produced by melting naturally occurring high-purity quartz crystal sands in electric vacuum or oxy-hydrogen furnaces. It offers outstanding thermal shock resistance, high dielectric strength, and mechanical durability at an economical price point, making it the industry benchmark for furnace viewports, semiconductor handling tools, and infrared heaters. In contrast, synthetic fused silica is produced by the chemical vapor deposition (CVD) or flame hydrolysis of silicon tetrachloride (SiCl&sub4;). This results in near-zero trace metallic contamination (< 0.5 ppm), virtually no bubble inclusions, and superior Deep UV (DUV) optical transmission down to 185–193 nm, ideal for excimer lasers and lithography mask blanks.
What dimensional tolerances and minimum thicknesses can VEZLO manufacture for quartz plates? +
Through precision multi-wire diamond sawing, double-sided planetary lapping, and CNC optical polishing, VEZLO produces ultra-thin quartz plates down to 0.2 mm ± 0.01 mm, as well as thick optical slabs up to 50 mm or more. Outer dimensions (circular discs or rectangular plates) can be machined up to 600 mm with lateral dimensional tolerances of ±0.05 mm (or ±0.01 mm upon request). Surface flatness can be controlled to λ/4 to λ/10 per 25 mm diameter, and surface roughness can achieve Ra ≤ 0.3–0.5 nm for ultra-demanding laser and wafer substrate uses.
Can fused quartz sheets withstand rapid thermal quenching and extreme temperature shifts? +
Yes. Due to an exceptionally low coefficient of thermal expansion (5.5 × 10−7 /°C between 20°C and 320°C), fused quartz possesses near-unrivaled thermal shock resistance. A standard 3 mm to 5 mm fused quartz plate can be heated to 1,100°C and immediately quenched into 20°C cold water without catastrophic cracking or structural failure. However, prolonged operation above 1,150°C in the presence of surface alkaline dust or fingerprint oils will initiate devitrification (nucleation into cristobalite), which degrades thermal shock resistance upon cooling.
How does hydroxyl (OH-) content influence the transmission of quartz glass sheets? +
Hydroxyl content fundamentally governs transmission at both the UV and infrared extremes. High-OH quartz (typically 800 to 1,200 ppm OH, often found in synthetic fused silica JGS1) prevents the formation of oxygen-deficiency color centers, maximizing deep UV transmission down to 185 nm. However, it introduces strong molecular absorption dips in the infrared spectrum at 1.38 μm, 2.22 μm, and especially 2.72 μm. For infrared pyrometry, gas sensing, and IR heating lamps, low-OH or "dry" electrically fused quartz (OH < 5 to 20 ppm, JGS3) is required to deliver broad, uninhibited transmission up to 3.5 μm.
What methods are used to inspect and certify custom quartz sheets before export? +
Every production batch undergoes a rigid three-tier inspection protocol: (1) Dimensional and geometric verification via digital micrometers, height gauges, and coordinate measuring machines (CMM); (2) Internal homogeneity, bubble, and inclusion inspection via high-intensity cross-polarized illumination and collimated laser scatter detection per ISO 10110 standards; (3) Spectral optical transmission confirmation across 200–3,000 nm utilizing calibrated spectrophotometers. Comprehensive inspection certificates, raw material purity declarations, and dimensional inspection reports are provided with all commercial shipments.
How does VEZLO pack brittle quartz sheets to prevent breakage during international transit? +
Fragile quartz sheets and optical plates are first individually wrapped with scratch-free lens tissue and vacuum-sealed or encased in anti-static PE bags. They are then secured inside form-fitting high-density polyethylene (EPE) foam cutouts within rigid inner cartons. For international freight, these inner packs are enclosed in heavy-duty, shock-isolated, fumigation-free plywood crates equipped with desiccant packs, corner edge protectors, and external "Fragile / Do Not Tip" indicator labels to ensure damage-free arrival by sea, air, or global express courier.