What purity is your fused quartz glass?

Our standard tubes, rods, plates and lab ware are made from 99.99% SiO2 fused quartz. Optical-grade and UV-grade materials can be selected for window and wafer applications.

Can you manufacture quartz parts according to my drawing?

Yes. Send a 2D/3D drawing or sketch with dimensions and tolerances. We support cutting, laser drilling, grooving, bending, welding, flame polishing and grinding.

What temperature can fused quartz withstand?

Fused quartz is typically used continuously up to about 1100 °C and for short periods up to about 1300 °C, with a softening point near 1683 °C. Actual limits depend on wall thickness, atmosphere and thermal cycling.

Which shipping and payment terms do you accept?

We ship under FOB, CFR, CIF, EXW, CIP, FCA, CPT, DDP, DDU and express delivery, and accept T/T, L/C, PayPal, credit card, Western Union, MoneyGram and escrow.

OEM/ODM Fused Silica Flange Manufacturer & Supplier for the Banja Luka market

Q: What is the minimum order quantity?

Most custom quartz parts start from 1 piece, which supports prototyping and laboratory trials. Small consumables such as BET sample tubes typically start from 10 pieces.

Precision Component Portfolio

Featured Fused Quartz & Silica Glass Products

Factory-direct high-purity quartz assemblies engineered to strict ISO 9001 and SEMI quality standards, offering zero contamination, exceptional thermal resistance, and extreme optical clarity.

Engineering Whitepaper: Technical Specifications & Material Science of Fused Silica Flanges

In modern high-temperature processing, chemical distillation, and ultra-high vacuum (UHV) environments, standard borosilicate or metallic viewports fail due to thermal fatigue, chemical degradation, or outgassing. Fused silica ($SiO_2$), manufactured through the thermal fusion of natural or synthetic quartz crystals, represents the gold standard for high-performance sealing flanges, optical viewports, and process chamber connections.

"The critical advantage of fused silica in industrial flange applications lies in its near-zero coefficient of thermal expansion ($\approx 5.5 \times 10^{-7} / \text{K}$). This provides immunity against thermal shock up to $1100^\circ\text{C}$ continuous working temperature, preventing micro-fractures in rapid heating-cooling cycles."

Material Purity & Structural Integrity

Our OEM/ODM fused silica flanges utilize raw material sourced directly from Donghai, Jiangsu—world-renowned for high-purity natural silica reserves. Synthetic fused silica ($SiO_2 \ge 99.999\%$) and high-purity electric-fused silica ($SiO_2 \ge 99.99\%$) are carefully selected depending on operating conditions. Metallic impurity levels (including $Fe, Al, Ti, Na, K$) are strictly monitored below $10 \text{ ppm}$, eliminating metallic ion leaching in high-purity chemical processes.

Physical / Chemical Property	Technical Value (Fused Silica)	Borosilicate Comparison
Chemical Composition ($SiO_2$)	≥ 99.99%	≈ 80%
Density	2.20 g/cm³	2.23 g/cm³
Coefficient of Thermal Expansion (20-300°C)	5.5 × 10&sup7; / K	32.5 × 10&sup7; / K
Maximum Continuous Working Temperature	1100 °C	500 °C
Short-term Peak Temperature	1300 °C	600 °C
Annealing Point	1215 °C	560 °C
Dielectric Strength (20°C, 1MHz)	25-40 kV/mm	10-15 kV/mm
Spectral Transmission (UV to Near-IR)	> 90% (200nm - 2500nm)	> 80% (350nm - 2000nm)

Precision Engineering Standards (DIN, ISO, SEMI, CF/KF)

To integrate seamlessly into existing chemical pipelines, vacuum chambers, and thermal furnaces, our flanges are fabricated under ISO 9001 quality controls. We custom-machine vacuum flanges compliant with standard ISO-K/ISO-F, KF (NW), and CF (ConFlat) dimensions, as well as proprietary OEM bolt patterns. Options include precision optical polished surfaces ($Ra < 0.5 \text{ nm}$ for laser windows), flame-polished sealing lips, beveling, laser-etched bolt holes, and ground mating faces to guarantee helium leak rates lower than $1 \times 10^{-9} \text{ mbar}\cdot\text{L/s}$.

Regional Focus

Industrial Application Scenarios in Banja Luka & Republic of Srpska

Banja Luka serves as the economic, administrative, and industrial engine of the Republic of Srpska (Bosnia and Herzegovina). Modernization across local manufacturing, thermal energy generation, and academic research demands reliable, high-specification quartz components.

1. Thermal Power Plants & Energy Infrastructure

In the regional energy sector—including thermal power station monitoring (such as nearby Ugljevik and Gacko facilities) and industrial heating systems in the Vrbas valley—fused silica flanges are deployed as high-pressure sight glasses and boiler combustion viewports. Their ability to withstand continuous thermal gradients over $1000^\circ\text{C}$ while resisting corrosive fly-ash gases makes them essential for flue gas monitoring equipment.

2. Chemical & Pharmaceutical Processing

Banja Luka’s chemical processing and pharmaceutical synthesis operations handle concentrated acids (including $HCl, H_2SO_4, HNO_3$) and organic solvents at elevated temperatures. Standard steel or glass-lined flanges suffer acid corrosion or thermal shock cracking. Fused silica flanges exhibit complete chemical inertness to all acids except Hydrofluoric ($HF$) and hot Phosphoric ($H_3PO_4$), ensuring zero process fluid contamination.

3. Metal Casting & Heat Treatment Metallurgy

The metalworking, foundry, and machinery sector surrounding Banja Luka relies heavily on induction furnaces, vacuum annealing, and heat-treatment kilns. Fused silica flanges serve as critical isolation barriers and pyrometer optical windows. Infrared pyrometers measure molten metal temperatures through optically clear silica flanges without signal distortion across $0.8 \mu m$ to $2.5 \mu m$ wavelengths.

4. Academic & R&D Research Laboratories

Research institutes, including laboratories at the University of Banja Luka (Univerzitet u Banjoj Luci), require specialized quartz apparatus for material analysis, X-Ray Diffraction (XRD) sample chambers, and Chemical Vapor Deposition (CVD) tube furnaces. Our custom ODM drawing fabrication service allows researchers to specify non-standard flange dimensions with 1-piece MOQ.

Market Trends: Industrial Modernization & Green Energy in Banja Luka

As Bosnia and Herzegovina moves closer toward EU environmental standards and regional Industry 4.0 integration, industrial facilities in Banja Luka are undergoing rapid technological transformation. Key macro-trends shaping quartz glass demand include:

1. Transition to High-Efficiency, Low-Emission Boilers

In compliance with stricter atmospheric pollution standards, energy producers in the Republic of Srpska are replacing outdated flame-monitoring systems with continuous optical sensors and laser spectrographic diagnostics. These systems mandate high-transmittance UV-grade fused silica flange windows capable of operating under high pressure ($> 10 \text{ bar}$) without clouding or devitrification.

2. Upscaling Local OEM Machinery Manufacturing

Local machine builders in Banja Luka supplying regional Balkan markets (Serbia, Croatia, Slovenia) are increasingly integrating custom quartz sub-assemblies directly into their machinery designs. These original equipment manufacturers require dependable Chinese fabrication partners who can offer precise tolerances ($\pm 0.05 \text{ mm}$), swift technical drawing turnarounds, and custom OEM logo labeling.

3. Photovoltaic & Renewable Material Processing

The expansion of solar energy initiatives across Southern Europe has spurred interest in local crystal growth and semiconductor component testing. Fused silica apparatus, bell jars, and flanged reaction tubes are fundamental in silicon crystallization and high-purity thermal processing where zero alkali metal contamination is permissible.

Manufacturing Excellence

Custom OEM/ODM Engineering & Machining Capabilities

Lianyungang Zelvo Quartz Products Co., Ltd. combines advanced CNC ultrasonic glass machining, laser precision drilling, and traditional glassblowing mastery to produce bespoke fused silica flange solutions.

Precision CNC Machining & Grooving

Equipped with 5-axis ultrasonic CNC diamond machining centers, we mill complex bolt circles, O-ring sealing grooves (Viton/Kalrez compatible), ground joints, and customized flange profiles with dimensional tolerances down to $\pm 0.02 \text{ mm}$.

Micro Laser Drilling & Cutting

Laser drilling capabilities allow crack-free, burr-free micro-holes, gas entry ports, and sensor pass-through slots without thermal stress concentration, maintaining structural purity across high-vacuum applications.

Flame Welding & Annealing

Master quartz glassblowers perform high-temperature hydrogen-oxygen flame fusion, seamlessly joining quartz flanges onto quartz tubes, bell jars, and reactors. Every finished assembly undergoes computer-controlled thermal stress relief annealing at $1150^\circ\text{C}$ to purge internal stresses.

Procurement & Technical Support

Banja Luka Buyers Frequently Asked Questions (FAQ)

Clear answers to technical, logistics, and purchasing questions from engineers and buyers in Bosnia and Herzegovina.

1. What is the typical lead time for custom OEM fused silica flanges shipped to Banja Luka?

For standard prototypes and customized samples, production takes 5 to 7 working days following drawing approval. Express air freight (via DHL, FedEx, or UPS) to Banja Luka or Sarajevo airport typically takes 4 to 6 business days. Bulk orders are shipped via sea or multimodal land transport with full export documentation.

2. How do you handle customs clearing and trade terms for Bosnia and Herzegovina (Republic of Srpska)?

We support flexible Incoterms including FOB, CFR, CIF, EXW, FCA, and DDP (Delivered Duty Paid). For DDP shipments to Banja Luka, we manage all export customs, import clearance, local VAT, and import duties, delivering the order directly to your facility door without administrative burden.

3. Can you manufacture fused silica flanges directly from our CAD or STEP files?

Yes. Our engineering department accepts 2D drawings (DWG, DXF, PDF) and 3D CAD files (STEP, IGES, SLDPRT). Within 2 hours of receiving your files, our technical team reviews wall thickness, tolerances, and thermal feasibility, providing an immediate quotation and design-for-manufacturability feedback.

4. What optical polishing surface finishes can you achieve for viewports?

We offer optical polishing up to 80/50, 60/40, or 20/10 Scratch/Dig standards (MIL-PRF-13830B), achieving surface roughness $Ra < 0.5 \text{ nm}$. This ensures optical transmittance above 92% in visible wavelengths and UV optical clarity suitable for spectroscopic inspection.

5. What is the Minimum Order Quantity (MOQ) for custom quartz parts?

We maintain a strict 1-piece Minimum Order Quantity (MOQ) for custom drawings, supporting academic trials at the University of Banja Luka and industrial R&D prototyping. For standard consumables, batch discounts apply.

6. How do you guarantee fragile quartz products arrive safely without breakage?

We utilize custom export-grade packaging consisting of high-density shock-absorbing EPE foam, vacuum-sealed inner wrapping, double-corrugated outer cartons, and reinforced fumigated wooden crates. All shipments are fully insured against transit damage.

7. What payment currencies and methods do you accept from Bosnian enterprises?

We accept wire transfer (T/T), Letter of Credit (L/C), PayPal, Credit Card, and Western Union. We accept payments in EUR, USD, and local currencies, matching your preferred corporate banking preferences.

Why Choose Zelvo Quartz

Your Direct-from-Factory Quartz Partner

Headquartered in Donghai, Lianyungang—China's premier quartz crystal capital—Lianyungang Zelvo Quartz Products Co., Ltd. combines raw material advantage with international export expertise.

Donghai Raw Material Advantage

Direct access to the world's largest quartz raw material market ensures cost efficiency, continuous raw tube/plate supply, and guaranteed purity ($99.99\% - 99.999\% SiO_2$) without material stockouts.

3-Stage Quality Control System

Every product undergoes raw material spectrographic testing, in-process dimensional laser checking, and final dark-room optical bubble/inclusion inspection prior to dispatch, achieving a 99.6% acceptance rating.

Engineer-Led Support within 2 Hours

Communicate directly with experienced glass technicians and export engineers who understand thermal, chemical, and physical quartz properties, avoiding miscommunication and saving project time.

OEM/ODM Fused Silica Flange Manufacturer & Supplier for the Banja Luka Market