What sizes of fused quartz tube can VEZLO produce?

Standard transparent fused quartz tubes are produced from 2 mm to 500 mm outer diameter. A 520 mm large-diameter high-purity quartz tube has also been developed for semiconductor diffusion and oxidation furnaces. Wall thickness, length and end finishing are made to drawing.

What is the difference between fused quartz and fused silica?

Fused quartz is made by melting high-purity natural quartz crystal or sand, while synthetic fused silica is produced from silicon-based precursors such as SiCl4. Synthetic silica offers higher deep-UV transmission, while fused quartz provides excellent thermal stability and purity at a lower cost for lamps, furnaces, labware and most industrial uses.

What is an ozone-free quartz tube?

An ozone-free quartz tube is doped to absorb the 185 nm ultraviolet line that converts oxygen into ozone, while still transmitting the 254 nm germicidal wavelength. It is widely used for UV sterilization lamps in water, air and surface disinfection where ozone is not wanted.

Do you accept OEM and ODM custom quartz parts?

Yes. VEZLO manufactures to customer drawings, including tubes with closed or flared ends, ground joints, flanges, quartz boats, cleaning tanks, crucibles, plates, windows and rods, as well as private-label packaging.

How fast does VEZLO respond to technical requests?

The average response time is within 2 hours, and around 50% of buyers place repeat orders. Requirements can be sent to info@vezloquartz.com or via the contact page.

How are fragile quartz products packed for export?

Quartz parts are typically protected individually with foam or pearl cotton, then packed in reinforced cartons or fumigation-free plywood cases suitable for sea, air and express shipping.

China Best Quartz Sheet Suppliers & Exporters

Technical Sourcing Whitepaper: Optical Standards, High-Purity Fused Silica Engineering, and Direct Manufacturing from Donghai, China

Precision Portfolio

Engineered Fused Quartz & Silica Products

Discover factory-direct fused silica plates, sight glasses, furnace viewports, and custom optical discs manufactured to strict ISO/DIN dimensional tolerances and exceptional thermal tolerances.

Round Quartz Plate Disc Fused Silica Clear Polished Custom Diameter

View Product

Laser Cut Quartz Glass Plate Fused Silica Precision Custom Size

View Product

Quartz Plate 100x100mm 200x200mm Fused Silica Clear Custom Cut

View Product

Quartz Viewport Glass Quartz Window Plate Optical Window Quartz High Pressure

View Product

Quartz Oil Level Sight Glass Plate Fused Silica Clear Custom Size

View Product

Clear Fused Silica Quartz Glass Tube Blank

Quartz Glass Tube Raw Stock Clear Fused Silica Blank for Glassblowing

View Product

Quartz Glass Sheet 10mm 20mm 30mm Thick Fused Silica Heat Resistant

View Product

Quartz Fireplace Viewing Glass Plate Heat Resistant Fused Silica

View Product

≥99.99%

Ultra-High Purity Silicon Dioxide (SiO₂) Content

1,200°C

Continuous High-Temperature Thermal Resistance

≤20ppm

Total Metallic Impurities in Source Sand Melts

≤2h

Average Rapid Engineering Response Window

1. Strategic Procurement Overview: Why China Leads Global Quartz Sheet Supply

In modern industrial manufacturing, optical electronics, semiconductor fabrication, and photovoltaic production, fused quartz sheets and plates serve as critical, non-substitutable structural and optical substrates. Engineered from pure silicon dioxide, quartz glass bridges the gap between conventional industrial borosilicate glasses and synthetic single crystals. When global sourcing directors evaluate suppliers and exporters, China—and specifically Donghai County in Jiangsu Province—represents the pinnacle of supply chain density, raw material purity, thermal processing economies of scale, and advanced CNC machining capacity.

Donghai is internationally acknowledged as the quartz manufacturing capital of China. Concentrated regional reserves of high-purity natural quartz crystal and silica sands empower facilities like VEZLO Quartz Products Co., Ltd. to operate an integrated manufacturing loop. By managing everything from granular raw material purification (≤20 ppm trace metal levels) to continuous electrically fused drawing, precision slicing, optical double-sided lapping, and multi-axis CNC laser cutting, Chinese suppliers provide unmatched price-to-performance metrics without sacrificing purity or precision.

Strategic Buyer Insight: Sourcing fused quartz sheets directly from vertically integrated Chinese manufacturers cuts intermediate procurement margins by 30% to 50%, while guaranteeing end-to-end traceability of trace impurities from ingot smelting to surface inspection.

2. Material Science: Fused Quartz vs. Fused Silica for Industrial Sheets

A frequent ambiguity encountered during technical procurement involves the distinction between natural fused quartz and synthetic fused silica. While both materials exhibit greater than 99.9% silicon dioxide compositions, their production pathways yield distinct optical and physical properties that directly influence application success and component unit economics.

Evaluation Parameter	Natural Fused Quartz Sheets	Synthetic Fused Silica Sheets
Primary Precursor	High-purity natural quartz sand (Donghai/Pegmatite)	Chemical vapor synthesis (SiCl₄ / Siloxanes)
Typical SiO₂ Purity	99.99% – 99.999% (4N to 5N)	99.9999% (6N+)
Hydroxyl (OH⁻) Content	Standard low OH (<5 ppm to 30 ppm)	High OH (>800 ppm) to Low OH (<1 ppm) options
Optical Window	260 nm to 2,500 nm (Near-UV to Mid-IR)	185 nm to 2,100 nm (Deep UV DUV transmission)
Thermal Stability	Softening Point ~1,683°C; Annealing ~1,215°C	Softening Point ~1,580°C – 1,650°C
Cost Profile	Economical; optimal for bulk industrial sheets	High; reserved for specialized DUV lithography

For more than 90% of industrial viewport, high-temperature furnace observation, ultraviolet curing, sight glass, and laboratory plate requirements, natural fused quartz sheets provide superior mechanical stiffness, lower thermal deformation, and outstanding cost-efficiency compared to synthetic alternatives.

3. Enterprise Manufacturing Strengths: The VEZLO Advantage

Operating a modernized 33,000-square-meter (50 mu) production base in Donghai County with over RMB 10 million in fixed assets, VEZLO Quartz represents the vanguard of Chinese fused silica manufacturing. Our manufacturing excellence is recognized at both national and provincial levels:

Provincial S&T Project Recognition

Entrusted with the Jiangsu Provincial Science & Technology Support Project for ultra-pure 320 mm quartz components and recipient of national new-product review approvals for 520 mm large-diameter fabrications.

Total In-House Quality Control

From 13 certified grades of high-purity sand with metallic contaminants ≤20 ppm to vacuum continuous furnace casting, precision edge beveling, and double-side optical polishing (surface roughness Ra < 0.5 nm).

Verified Trade Reliability

Onsite-verified enterprise with active Trade Assurance backing, supporting multinational buyers across North America, Europe, and Asia with 50% repeat customer loyalty and rapid response SLAs under 2 hours.

4. Future Sourcing Trends: What Procurement Leaders Must Anticipate

As advanced technology sectors experience rapid generational shifts, quartz plate and sheet procurement requires strategic agility. Key technical vectors reshaping global supply expectations over the next decade include:

A. Ultra-Large Format and Heavy Thickness Requirements

With semiconductor fabrication expanding to larger wafer batches and PV manufacturing standardizing on oversized crystalline ingots, the need for thick (10 mm to 50 mm) and wide-aperture quartz slabs (>1,000 mm x 1,000 mm) has surged. Fabricating thick sheets without micro-bubbles, air lines, or internal refractive indexing striations demands precise multi-day thermal annealing profiles that only high-capacity furnace operators can sustain.

B. Precision CNC Micro-Machining and Laser Milling

Standard circular and rectangular dimensions are increasingly superseded by complex geometries featuring stepped edge profiles, micro-hole arrays, laser-cut custom apertures, polished bevels, and countersunk mounting points. Traditional waterjet cutting can introduce micro-fractures along edge profiles; advanced suppliers have transitioned to multi-axis laser cutting, reducing edge chipping below 20 microns.

C. Traceability and Standardized Certification

Tier-1 original equipment manufacturers (OEMs) demand comprehensive GDMS (Glow Discharge Mass Spectrometry) impurity analysis per ingot lot, measuring critical elements including Fe, Al, Ti, Ca, Mg, Na, Li, and K. Suppliers able to guarantee uniform metal profiles below 20 ppm across scalable export runs are securing long-term master service contracts.

5. Technical FAQ: Quartz Sheet Procurement & Engineering

What are the maximum operational temperatures for fused quartz sheets?

Fused quartz sheets can operate continuously at temperatures up to 1,100°C without mechanical sagging or deformation. They can endure short-term peaks up to 1,250°C to 1,300°C. The softening point occurs around 1,683°C. Additionally, fused quartz possesses an ultra-low coefficient of thermal expansion (5.5 × 10⁻⁷ /°C), enabling it to survive rapid quenching into ice water from 1,000°C without thermal stress shattering.

How do you prevent bubbles and air lines in thick quartz glass plates?

Bubbles and inclusions originate primarily from trapped atmospheric gases during melting or impurities in precursor sands. We resolve this by utilizing refined raw quartz sand with metallic contaminants ≤20 ppm and utilizing vacuum electric melting furnaces. Post-casting thermal conditioning and slow-cycle annealing relieve internal stresses and minimize bubble density to class 0/1 optical standards.

What surface finishes and edge profiles are achievable for custom quartz plates?

We provide multiple surface treatments: optical pitch polishing, mechanical double-sided lapping, and fine-ground matte finishes. Optical polish finishes achieve surface scratch-dig ratings of 60/40, 40/20, or 20/10 with roughness Ra ≤ 0.5 nm to 1 nm. Edge profiles include straight cut, 45° chamfered/beveled edges, C-cut edge rounding, and fire-polished margins to eliminate stress risers.

Can fused quartz withstand exposure to hydrofluoric or phosphoric acid?

Fused quartz displays exceptional chemical inertness against almost all acids, including concentrated sulfuric, hydrochloric, and nitric acids, as well as organic solvents. The only major exceptions are hydrofluoric acid (HF), which attacks silica rapidly at all temperatures, and concentrated phosphoric acid (H₃PO₄) at temperatures exceeding 150°C. Alkaline solutions at elevated temperatures will also gradually etch the surface.

How does VEZLO pack and protect fragile quartz sheets during international transit?

Given the delicate nature of high-aspect-ratio quartz plates, we apply a multi-tier protective packing system. Individual sheets are wrapped with optical protective film, separated by shock-absorbing PE foam or pearl cotton, packed into rigid internal cartons, and finally secured inside custom-built, fumigation-free plywood crates reinforced with impact-resistant corner brackets and desiccants suitable for air, sea, or express transit.

Request a Precision Quartz Engineering Quote

Send our technical sales engineering team your CAD drawings, thickness specifications, optical transmission requirements, or prototype inquiries. We guarantee technical evaluations and quotations within 2 hours.