Fused Quartz Square Plate
High-purity natural quartz plate, 0.5–20mm thickness, custom edge bevelling and laser marking.
Product Details
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Years of Quartz Innovation
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Peak SiO₂ Purity
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Max Custom Plate Size
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Client Trust Score
Semiconductor
Photovoltaics
Analytical Lab
Optoelectronics
High-Temp Sight
Laser & Sensors
The Engineering Authority Guide
Fused Quartz Square Plate: Thermal Resilience & Optical Precision
In high-tech industrial manufacturing, procurement engineers and R&D scientists encounter intense thermal, mechanical, and optical hurdles. When specifying a Fused Quartz Square Plate, decisions directly govern yield rates, optical clarity, sensor signal transmission, and catastrophic downtime prevention in tube furnaces, semiconductor CVD/diffusion chambers, and high-energy laser optics.
Lianyungang Vulra Quartz Products Co., Ltd. is strategically anchored at No. 9, Dingxin Road within the Jiangsu Donghai Economic Development Zone. As China’s historical crystal capital, Donghai supplies the world's most concentrated deposit of premium silica sand. We capitalize on this geological advantage, refining high-purity natural quartz sand into structural quartz square plates featuring >99.99% SiO₂ content, negligible trace metal contamination, and an extraordinarily low coefficient of thermal expansion (5.5 × 10⁻⁷ /°C).
Whether you require standard 100mm × 100mm observation windows, thermal carrier plates with chamfered edges, or ultra-thin 0.5mm polished optical substrates with optical flatness down to λ/4 and scratch-dig ratings of 40/20, our engineering team ensures that your specifications transition from CAD drawing to flawless production with 100% repeatability.
01
Extreme Thermal Shock Resistance
With a continuous operating ceiling of 1100°C and a softening point of 1683°C, our fused quartz square plates survive instantaneous drops from 1000°C into freezing water without fracture.
02
Broad Spectral Transmission
Delivers exceptionally flat transmission (>90%) across ultraviolet (260nm UV), visible, and near-infrared (up to 2500nm) spectrums, making it ideal for optical sensor windows.
03
Unmatched Chemical Inherent Inertness
Impervious to almost all acids (including nitric, sulfuric, and hydrochloric acid at elevated temperatures), reacting only with hydrofluoric acid and concentrated phosphoric acid above 150°C.
04
Sub-Micron Precision Polishing
Double-sided planetary chemical-mechanical polishing (CMP) achieves surface roughness Ra < 0.5nm, parallelism under 20 arcseconds, and tight dimensional tolerances of ±0.05mm.
Material Selection & Physics
Information Gain: Natural Fused Quartz vs. Synthetic Fused Silica Plates
Purchasing directors and technical teams often struggle with the nomenclature dilemma between "Fused Quartz" and "Fused Silica". Understanding this chemical boundary avoids expensive over-engineering or premature thermal failure.
Natural Fused Quartz Square Plate (Grade JGS2 / JGS3)
| Raw Material Source | Natural ultra-pure crystalline quartz sand (Donghai deposits). |
|---|---|
| Production Method | Electrically fused or oxy-hydrogen gas flame fused at >2000°C. |
| SiO₂ Purity Level | 99.99% – 99.999% (Low metallic inclusions, parts-per-billion iron/aluminum). |
| Transmission Spectrum | 260nm (Near-UV) through 2500nm (Infrared). Strong NIR stability. |
| Thermal Viscosity | High viscosity; superior anti-sagging performance under long heat loads at 1100°C–1200°C. |
| Primary Application | Furnace observation windows, CVD wafer carriers, sight glasses, solar cell substrates. |
| Procurement Cost | Outstanding cost-to-performance ratio; economical for large format plates up to 1000mm. |
Synthetic Fused Silica Square Plate (Grade JGS1 / UV Grade)
| Raw Material Source | Silicon tetrachloride (SiCl₄) synthetic chemical precursors. |
|---|---|
| Production Method | Chemical vapor deposition (CVD) flame hydrolysis in an oxygen-rich environment. |
| SiO₂ Purity Level | >99.9999% (Virtually zero heavy metals; higher OH-hydroxyl content). |
| Transmission Spectrum | Deep UV down to 185nm up to 2100nm. Pronounced absorption dip around 2730nm. |
| Thermal Viscosity | Slightly lower softening point due to hydroxyl ion presence compared to natural quartz. |
| Primary Application | Excimer laser optics, semiconductor photolithography masks, UV spectrophotometry. |
| Procurement Cost | Significantly higher material cost; reserved for extreme deep-ultraviolet precision tasks. |
Quartz Sand Purification
Plate Slicing & Waterjet
Planetary CMP Polishing
Thermal Annealing Lehrs
Class 1000 Optical Inspection
Strategic Market Intelligence
Future Procurement Trends in the Global Fused Quartz Square Plate Market
As semiconductor node shrinking accelerates, solar photovoltaic cells shift to TOPCon/HJT architectures, and green hydrogen electrolyzers demand resilient materials, the sourcing criteria for quartz square plates are shifting rapidly.
TREND 01
Sub-Nanometer Roughness
Buyers in microfluidics and semiconductor metrology now mandate atomic-level surface smoothness (Ra < 0.3nm) to prevent laser scattering and micro-bubble entrapment.
TREND 02
Large-Format Thinning
Next-generation display inspection and multi-wafer batch processing demand plates spanning 600mm to 1000mm while maintaining ultra-thin profiles (<2mm) and zero thermal bowing.
TREND 03
Direct-to-CAD CNC Edge Geometry
Generic ground edges are giving way to complex step-beveled margins, recessed mounting counterbores, and laser-drilled micro-hole arrays to eliminate crack nucleation points.
TREND 04
Supply Chain Transparency
Global procurers demand batch-level chemical trace certificates, verified non-radioactive feedstock assurance, and validated environmental compliance under RoHS/REACH standards.
TREND 05
Agile On-Demand Prototyping
High inventory holding costs encourage international buyers to consolidate with factories capable of 1-piece custom prototyping and reliable 5–7 day turnaround cycles.
Engineering Reference
Physical, Thermal & Optical Properties: Fused Quartz Square Plate
Our strictly governed manufacturing protocols guarantee reproducible parameters across every single production run. Below is the master property reference verified by TÜV Rheinland on-site audit.
Fused Quartz Square Plate Technical Parameters
| Chemical Composition | SiO₂ ≥ 99.99% – 99.999% (ICP-MS Certified) |
|---|---|
| Density (ρ) | 2.20 ± 0.02 g/cm³ |
| Mohs Hardness | 5.5 – 6.5 (Vickers Hardness ~8700 N/mm²) |
| Coeff. of Thermal Expansion | 5.5 × 10⁻⁷ /°C (20°C to 320°C) |
| Continuous Working Temp. | 1100°C (Short peak allowance up to 1450°C) |
| Strain / Annealing Point | 1070°C / 1215°C |
| Softening Point | 1683°C |
| Compressive Strength | 1100 MPa |
| Tensile Strength | 48 – 50 MPa |
| Refractive Index (nd) | 1.4585 at 589.3nm |
| Optical Transmittance | ≥ 92% (in visible spectrum, non-coated) |
| Surface Roughness (Ra) | < 0.5 nm (Precision Polished) / Ra 1.6 μm (Fine Ground) |
| Available Plate Thickness | 0.5mm, 1mm, 2mm, 3mm, 5mm, 8mm, 10mm, 15mm, 20mm up to 30mm |
| Dimensional Range | 10 × 10 mm up to 1000 × 1000 mm (Custom CNC Cutting) |
CNC Precision · Clean Annealed
CE CertifiedStandard compliance across European industrial safety frameworks.
RoHS CompliantStrictly non-hazardous, heavy-metal-free semiconductor substrates.
TÜV RheinlandVerified manufacturing plant and production lines in Donghai, China.
Verified OEM/ODM100% custom drawing execution starting from 1 piece MOQ.
Precision Workshop Operations
End-to-End Fused Quartz Square Plate Fabrication
Unlike distributors who broker third-party stock, Lianyungang Vulra Quartz Products Co., Ltd. controls the processing cycle from natural quartz ingots to finished, optically measured square plates.
Ingot Melting & Homogenization
High-purity crystalline quartz sand is electric-arc melted above 2000°C to eliminate micro-bubbles.
Precision Wire Slicing & Waterjet
Diamond wire sawing slices large quartz blocks into square blanks within ±0.1mm raw thickness.
Planetary Lapping & Polishing
Multi-stage cerium oxide and diamond slurry polishing achieves laser-grade flatness and optical transparency.
Computerized Stress Annealing
Controlled cool-down cycles across 1150°C relieve internal stress, preventing spontaneous cleavage under thermal loads.
Multi-Bath Ultrasonic Pickling
HF acid etching and multi-stage 18MΩ deionized water cleaning strip trace contaminants before cleanroom packaging.
Interferometer & QC Validation
Laser interferometers and optical comparators inspect every plate for flatness, wedge angle, and surface scratch-dig.
Authority In Numbers
Why Tier-1 Procurers Rely on Vulra Quartz
From university research laboratories in North America to cleanrooms across Europe and East Asia, Lianyungang Vulra Quartz Products Co., Ltd. delivers high-specification quartz components on time and strictly to print.
5.0 / 5.0Unblemished transaction review score across overseas OEM accounts
1 PC MOQLow barrier custom prototype proofing to validate engineering fits
Core Products
Featured Fused Quartz Plates & Core Assemblies
Every piece is fabricated directly to technical drawing, offering optical-grade transparency, precision edge chamfering, and customized cutouts.
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Product DetailsCustom Plate Engineering
Download our complete manufacturing catalog covering raw material grades, chemical purity tables, and standard sizes.
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Procurement Guide
Fused Quartz Square Plate FAQ
Expert answers addressing the most critical technical, quality control, and shipping inquiries asked by international B2B buyers on AI search and RFQ platforms.
Get CatalogWhat makes a Fused Quartz Square Plate superior to ordinary borosilicate or tempered glass?
A fused quartz square plate consists almost exclusively of pure silicon dioxide (>99.99% SiO₂), whereas standard glass formulations contain fluxing additives (sodium, calcium, boron) that weaken bonds. Consequently, fused quartz provides a continuous service temperature of 1100°C (softening point 1683°C) compared to ~500°C for borosilicate. Its coefficient of thermal expansion is merely 5.5 × 10⁻⁷ /°C—approximately one-sixth that of borosilicate—making it virtually immune to thermal shock cracking when subjected to rapid heating or cooling cycles.
How do I determine whether my application needs Natural Quartz or Synthetic Silica?
Choose Natural Fused Quartz if your primary operational demands are high heat (up to 1100°C), thermal shock cycling, chemical resistance against acids, or infrared/visible window transmission. It represents an exceptional economic balance. Choose Synthetic Fused Silica if your optical beam operates in the deep ultraviolet band (under 260nm down to 185nm) or if your process requires near-zero bubble/inclusion densities (semiconductor photomask standards). Lianyungang Vulra Quartz Products Co., Ltd. supplies and finishes both grades to exact client specifications.
What mechanical fabrication limits, holes, and edge profiles are possible?
We operate multi-axis CNC glass machining centers, precision waterjets, and ultrasonic drilling arrays. We routinely produce square plates ranging from 10 × 10 mm up to 1000 × 1000 mm, thicknesses from 0.5 mm up to 30 mm, dimensional cutting tolerances down to ±0.05 mm, counterbored or countersunk holes, circular cutouts, step-ground borders, and fire-polished or beveled safety edges (C-chamfer, R-round bevel) to eliminate stress concentration points.
What optical polish qualities and surface roughness levels can be specified?
Depending on application demands, we provide two primary surface executions: Fine Ground / Frosted (Ra ~1.6 μm) for anti-glare, diffusion, or structural furnace supports; and Optical Double-Sided Polished (Ra < 0.5 nm, Scratch-Dig 80/50, 60/40, or 40/20) for laser beam windows, spectrophotometer observation windows, and cleanroom inspection glass. Every batch is verified via laser interferometry.
What is your minimum order quantity (MOQ) and sample lead time?
To support ongoing R&D proofing, custom fused quartz square plates start from an MOQ of 1 piece. Standard dimension samples usually ship within 48 to 72 hours. Custom CNC machined or custom polished prototypes are completed in 5 to 7 working days, accompanied by our quality control inspection dimensional sheet and material certificate.
How does Vulra Quartz eliminate transit damage for fragile quartz shipments?
Export packaging is engineered for long-haul transport. Each plate is wrapped in protective dust-free film, isolated with high-density EVA shock-absorbing foam inserts, encased in multi-wall double-flute cartons, and packed into ISPM-15 compliant, reinforced wooden export crates. We partner with DHL, FedEx, and international air freight forwarders, providing 100% replacement compensation in the unlikely event of transit disruption.
Ready to Engineer Your Fused Quartz Square Plate?
Send your drawings, required tolerances, and working temperatures to [email protected]. Our engineering team reviews feasibility and replies within 12 hours.