Direct factory supply from our comprehensive smelting and CNC cold-working facility in Donghai to Western Greece. Custom edge-chamfering, laser-drilling, and optical polishing available to drawing.
Spectrophotometer-grade fused silica plate offering over 90% transmission from 190nm deep ultraviolet to 2100nm infrared band. Ideal for laser diagnostics and spectroscopic research.
Get Catalog
Heavy-duty autoclave and reactor viewing discs designed to withstand dynamic hydrodynamic pressure up to 10 MPa with zero distortion and superior chemical inertness.
Get Catalog
Engineered specifically for boiler ports, combustion kilns, and thermal exhaust conduits. Unmatched resistance to acute thermal shock with near-zero linear expansion.
Get Catalog
Ultra-flat quartz substrate with precision surface parallelism (λ/4) for chemical acid digestion, biophotonic analysis, and wafer handling in microelectronics cleanrooms.
Get Catalog
Thick structural quartz slabs cut and lapped for semiconductor diffusion furnace liners, high-radiation shielding, and metallurgical vacuum melting ports.
Get Catalog
Double-side pitch-polished window blanks (scratch-dig 40/20 or 20/10) manufactured for optoelectronic sensor covers, lithography masks, and laser transmission filters.
Get Catalog
Transparent thermal sight windows for biomass stoves, specialized gas heaters, and industrial heat exchangers, providing safety integrity and total optical clarity without yellowing.
Get Catalog
Custom-machined quartz discs with laser-cut center concentric ports, chamfered internal countersinks, and stepped edge notches for sensors, probes, and vacuum fittings.
Get CatalogPatras, as the third-largest urban economy in Greece and the central logistical hub of Western Greece and the Peloponnese, represents a critical intersection of academic optoelectronics, maritime industrialization, and pharmaceutical synthesis. The technological landscape in Patras—anchored by the University of Patras, the Foundation for Research and Technology Hellas (FORTH/ICE-HT), and the Patras Science Park—requires rigorous optical-grade glass materials that far exceed standard borosilicate or soda-lime glass formulations.
When selecting optical observation windows and sight glass for aggressive operational environments in the Patras Industrial Area (BIPE Patras) and coastal port installations, mechanical engineers and chemical technicians consistently encounter extreme parameters: continuous temperatures exceeding 1000°C, direct corrosive exposure to volatile acidic reagents, maritime saline fog, and laser wavelength dispersion challenges. Synthetic fused silica (SiO₂) provides the definitive structural solution, featuring an amorphous silicon dioxide molecular matrix that yields an extraordinarily low coefficient of thermal expansion (5.5 × 10⁻⁷ /°C) and an exceptionally broad spectral transmission bandwidth ranging from deep ultraviolet (UV-C at 190nm) through near-infrared (NIR up to 2100nm).
VEZLO Quartz operates as an authentic primary manufacturer and international supplier, eliminating intermediary trader markups for Greek enterprises. Situated in Donghai County—the globally recognized epicenter for quartz raw materials—our facility integrates continuous electric-arc fusing, precise gas-oxygen thermal flame shaping, and micron-level diamond cold-lapping. Our direct supply channel to Patras, backed by specialized air-freight consolidation to Athens/Patras and multimodal shipping via the Port of Patras, guarantees laboratory and factory clients reliable material supply certified to international ASTM and ISO standards.
| Material Engineering Parameter | High-Purity Fused Quartz (VEZLO) | Borosilicate Glass 3.3 | Sapphire Optical Glass (Al₂O₃) |
|---|---|---|---|
| Chemical Purity Matrix | SiO₂ ≥ 99.99% (≤20 ppm metals) | SiO₂ ≈ 81%, B₂O₃ ≈ 13% | Al₂O₃ ≥ 99.99% |
| Thermal Shock Resistance (ΔT) | ΔT 1100°C to Ice Water: No Fracture | ΔT ≈ 150°C - 200°C | ΔT ≈ 300°C |
| Coefficient of Thermal Expansion | 5.5 × 10⁻⁷ /°C (Near Zero) | 3.3 × 10⁻⁶ /°C | 5.8 × 10⁻⁶ /°C |
| UV-C Transmittance Band (254nm) | > 90% High Optical Transparency | < 10% (Significant Absorption) | > 80% (High Cost Factor) |
| Continuous Maximum Working Temp | 1100°C (Softening at 1683°C) | 450°C - 500°C | 1600°C - 1800°C |
| Chemical Resistance Profile | Inert to All Acids (except HF, hot H₃PO₄) | Moderate Alkali & Acid Attack | Inert to Most Industrial Reagents |
Engineered for the demanding operational demands of scientific laboratories, marine equipment, and manufacturing clusters across the Achaea regional unit.
The Port of Patras functions as the vital maritime gateway connecting Greece to the Italian Adriatic ports of Bari, Brindisi, Ancona, and Venice. Vessel propulsion, exhaust gas scrubbers, and offshore telemetry stations require heavy quartz sight glasses. Our fused silica plates withstand corrosive marine saline mist, cyclic moisture condensation, and internal thermal pressure in shipborne boilers without clouding or surface pitting.
The Department of Physics, Chemical Engineering, and Materials Science at the University of Patras, alongside ICE-HT research facilities, conduct cutting-edge investigations in laser ablation, femtosecond spectroscopy, and photochemical kinetics. Our double-side polished quartz optical windows offer surface flatness of λ/4 to λ/10, providing non-birefringent, high-fluence laser window solutions for beam steering and vacuum sample chambers.
The Patras Industrial Area hosts prominent packaging, food and beverage processing, brewing, and chemical formulation plants. Sight glasses deployed in aseptic bioreactors, CIP (clean-in-place) steam sterilizers, and distillation columns must tolerate continuous 135°C steam sterilization and harsh nitric/caustic wash cycles. High-purity fused silica prevents silicate leaching and guarantees food-contact regulatory compliance.
How European decarbonization mandates and regional high-tech investments are redefining technical glass procurement standards.
Over the past five years, industrial buyers and academic institutions across Greece have accelerated the transition from classical DIN 7080 borosilicate gauge glasses to custom fused silica quartz windows. Driven by European Union green transition investments under Horizon Europe and the National Recovery and Resilience Plan (Greece 2.0), Patras is cementing its role as an innovation corridor. Three clear market trajectories dominate procurement patterns:
1. Expansion of High-Efficiency UV-C Disinfection & Water Treatment: Municipal utilities in Western Greece and naval operators transiting the Gulf of Patras are rapidly retrofitting water treatment and ballast systems with high-intensity ultraviolet systems. Unlike traditional borosilicate, which absorbs germicidal UV-C wavelengths, fused quartz allows unhindered transmission of the 254 nm germicidal line, optimizing pathogen destruction with minimum electrical consumption.
2. Solar Thermal Concentration & Green Hydrogen Pilot Plants: Greece's abundant solar irradiance has spurred R&D into concentrated solar power (CSP) receivers and high-temperature electrolysis for clean hydrogen production. Quartz sight glasses serve as an indispensable barrier in high-temperature solar reactors, operating reliably up to 1100°C without mechanical sagging or thermal devitrification.
3. Direct-from-Source OEM Supply Chains: Greek procurement directors are progressively bypassing regional European distributors who maintain high stock markups and protracted lead times. By ordering directly from primary smelting manufacturers like VEZLO Quartz, Greek enterprises achieve significant procurement savings, verified 3.1 material certificates, and rapid custom fabrication to specialized CAD drawings.
Uncompromising manufacturing pedigree rooted in Donghai—China’s quartz capital—with end-to-end quality control from raw sand to crated glass.
Direct supply of high-purity quartz sand refined to total trace metal impurities of ≤20 ppm, preventing micro-bubble crystallization, thermal weakness, and optical birefringence.
Developers of the 320mm semiconductor furnace tube under the Jiangsu Science & Technology Project, and the newly developed 520mm high-purity tube for advanced integrated circuits.
State-of-the-art cold-working machinery producing quartz plates from 0.5mm to 50mm thickness, with custom diameters up to 600mm, stepped profiles, and optical polishing.
Every single quartz window is individually vacuum-sealed or encased in high-density EPE pearl foam, followed by export-grade fumigation-free wooden crates for risk-free international transit.
Clear answers addressing technical specifications, logistics, customs clearance, and manufacturing tolerances for engineering teams in Greece.
Fused quartz is produced by electrically melting high-purity natural rock crystal sand (SiO₂ ≥ 99.99%). It delivers outstanding continuous thermal performance up to 1100°C, extreme thermal shock resistance, and broad visible-to-infrared light transmission at an economical cost. Synthetic fused silica is created through the gas-phase chemical synthesis of silicon tetrachloride (SiCl₄), yielding an ultra-pure amorphous glass with practically zero metallic contaminants. Synthetic silica is chosen when deep ultraviolet transmission down to 185–193nm (UV-C excimer lasers) or maximum fluorescence-free optical clarity is mandated by research institutes in Patras.
Sight window thickness is calculated based on the unsupported viewing diameter, the maximum operating pressure, the operating temperature, and an appropriate engineering safety factor (typically 4 to 8 for pressurized installations). The classical DIN 7080 formula is applied: t = d_m × √((p × C) / (10 × σ_b)), where t is thickness in mm, d_m is the clamping diameter, p is design pressure in bar, and σ_b is the permissible bending stress. VEZLO Quartz provides complimentary engineering review and finite element validation for all custom pressure port orders.
For urgent academic prototyping, pilot plant installations, or maintenance shutdowns, we utilize priority door-to-door air express services (DHL, FedEx, UPS) directly to Patras, with transit times of 4 to 7 business days from dispatch. For larger containerized shipments or bulk sight glass consignments, sea freight is routed via Piraeus or directly through the Port of Patras (25 to 32 days). We supply complete commercial documentation including commercial invoices, packing lists with Harmonized System code 7002.31.0000, and Certificates of Origin to ensure seamless Greek customs clearance (EORI registered).
Yes. Our CNC glass-machining centers in Donghai are equipped for 5-axis ultrasonic milling, diamond edge beveling, waterjet blanking, and precision core drilling down to 1.0mm diameter. We regularly produce stepped sight glasses, concentric circular discs, elliptical viewing ports, and rectangular windows with counter-sunk bolt holes. In addition, we offer customized optical thin-film anti-reflective (AR) coatings, high-reflection (HR) dielectric mirrors, and hydrophobic surface treatments for specialized optoelectronic systems.
Export packaging is engineered for zero breakage. Optical windows are first cleaned, wrapped in dust-free lens tissue or cleanroom plastic wrap, and enclosed in customized high-density EPE foam pockets that prevent surface friction. These inner modules are sealed in rigid shock-absorbing intermediate cartons and placed into heavy-gauge export plywood cases reinforced with steel strapping. Each shipment is fully covered by international marine cargo insurance and verified by real-time tracking.
Consult with our quartz fabrication engineers today. Whether you need an individual prototype for laboratory research in Patras or production batches for OEM equipment manufacturing, we deliver precision, speed, and competitive pricing.
Get Catalog