Laser Cut Quartz Glass Plate Fused Silica Custom Size
CNC micro-machined and laser-profiled flat components with edge tolerance within ±0.05 mm. Non-chipping borders for optoelectronic housing.
Product Catalog
Precision Fused Quartz & Silica Solutions
Direct from Donghai's premier quartz cluster: optical-grade viewports, high-temperature flat discs, level glasses, and raw hollow tubing engineered to DIN/ISO standards for technical buyers in Split and the broader Croatian Adriatic region.
Quartz Observation Window Plate High Pressure Clear
Double-side optical pitch-polished fused silica sight glass designed for high-pressure autoclaves, reactors, and petrochemical vacuum sight ports.
Quartz Glass Sheet 10mm 20mm 30mm Thick Heat Resistant
Extra-thick heavy-duty thermal barrier shields. Near-zero expansion (5.5 × 10⁻⁷ /°C) preventing fracture under instantaneous 1000°C quenching.
Quartz Plate for Boiler Sight Glass Heat Resistant
Alkali-resistant, high-temperature sight plates for marine auxiliary boilers, shipyard incinerators, and thermal process fluid inspection ports.
Round Quartz Plate Disc Clear Polished Custom Diameter
Parallelism <30 arcsec, surface accuracy λ/4 to λ/10. Designed for laser window cavities, spectroscopy cells, and UV curing systems.
Quartz Glass Tube Raw Stock Clear Transparent Pipe Blank
Standard continuous-melt tubing blanks from OD 2 mm to 500 mm. Highly suitable for scientific glassblowers, heating pipes, and UV lamp sleeves.
Quartz Oil Level Sight Glass Plate Clear Custom Size
High-transmission reflex and transparent gauge glasses withstand corrosive lubricants, seawater vapor, and prolonged high mechanical strain.
Quartz Substrate Plate Semiconductor Polished
Semiconductor wafer-grade polished blanks with surface roughness Ra <0.5 nm, minimal bubble class, and zero heavy metal ionic leaching.
Split’s Evolving Engineering Ecosystem & Quartz Window Applications
As Dalmatia’s economic and logistical center, the city of Split, Croatia, occupies a distinctive position at the crossroads of traditional maritime engineering, high-tier marine research, and advanced light manufacturing. Historically sustained by the renowned Brodograđevna Industrija Split (Brodosplit) and its auxiliary naval engineering clusters across the Kaštela Bay basin, local procurement requirements for viewport materials have drastically transitioned from conventional borosilicate sight glasses toward ultra-pure synthetic fused silica and high-temperature fused quartz windows.
The operational conditions encountered across the Adriatic maritime transport network and deep-sea research offshore installations demand extreme material performance. Maritime auxiliary machinery, exhaust gas recirculation (EGR) scrubbers, ballast water UV purification arrays, and offshore oil separators operating out of Split face combined stresses: mechanical hydrodynamic pressure, salt-spray chemical attack, and relentless thermal cycling. Natural crystal-fused quartz windows delivered by VEZLO Quartz provide our Split partners with an indispensable advantage: a nominal softening point of 1,683°C, prolonged thermal endurance at 1,100°C, and exceptional mechanical tensile stability that completely eliminates catastrophic blowout risks in pressurized fluid lines.
Key Strategic Application Scenarios Across Split & Split-Dalmatia County
Maritime Sight & Level Systems
Installed across auxiliary steam boilers, bunkering lines, and fuel treatment centrifuges built or retrofitted in Dalmatian shipyards, providing crack-free visibility under 2.5 MPa to 10 MPa working pressure.
Ballast & Marine Water UV Systems
Ozone-free and germicidal quartz sleeves and observation port discs for IMO-compliant ballast water management systems (BWMS) deployed on Adriatic cargo carriers and passenger ferries.
Oceanographic & Institute Optics
Supplying deep-ultraviolet (DUV) transparent windows (JGS1/synthetic grade) to institutions like the Institute of Oceanography and Fisheries (IZOR Split) for in-situ underwater spectrophotometry and fluorometers.
Technological Trends Influencing Split's Industrial Procurement
Three principal technological shifts are reshaping the demand profile for optical quartz across Central and Southern Dalmatia:
- Transition from Soda-Lime to High-Purity Fused Silica in Clean Energy Research: Collaborative ventures led by the University of Split (Sveučilište u Splitu - FESB) in solar concentration experiments, photovoltaic thermal (PVT) prototypes, and hydrogen fuel generation cells require quartz windows with optical transmission exceeding 92% across both UV and visible spectrums (200 nm – 2500 nm).
- Decarbonization of Ship Propulsion and Auxiliary Systems: Adriatic luxury superyachts, mega-catamarans, and specialized transport vessels serviced around Split and Trogir increasingly incorporate real-time optical flame detectors, laser gas sensors, and continuous exhaust gas analyzers fitted with heat-resistant quartz watch-glasses.
- Pharmaceutical & Biochemical Purity Strictures: Emerging biochemical and analytical labs in the Dugopolje economic corridor require sight observation plates free of heavy-metal leaching (total conventional metals ≤20 ppm), resisting caustic sterilization and violent autoclaving washdowns.
Material Selection Guide: Fused Quartz vs. Borosilicate vs. Synthetic Silica
| Physical / Optical Property | Natural Fused Quartz (JGS2) | Synthetic Fused Silica (JGS1) | Borosilicate Glass 3.3 |
|---|---|---|---|
| SiO₂ Content | ≥ 99.99% | ≥ 99.9999% | ~ 81% |
| Continuous Service Temp | 1,100 °C | 1,150 °C | 450 °C |
| Thermal Expansion (CTE) | 5.5 × 10⁻⁷ /°C | 5.2 × 10⁻⁷ /°C | 33 × 10⁻⁷ /°C |
| UV Transmission (254 nm) | 85% – 90% | > 92% | < 10% (Blocks UV) |
| Hydrodynamic Thermal Shock | Extremely High (Water drop @ 1000°C safe) | Extremely High (Water drop @ 1100°C safe) | Moderate (Max ΔT ~150°C) |
| Chemical Inactivity | Immune to acids except HF, hot H₃PO₄ | Maximum purity, zero trace metal migration | Degrades in strong alkaline hot media |
Factory Integration
Why Split Engineers Source Directly from VEZLO
Operating a 50-mu production hub in Donghai County—the globally recognized Quartz Center of China—VEZLO eliminates middlemen, securing full provenance control from raw high-purity silica sand to finished crated optical viewports.
State-Backed Engineering R&D
Our large-scale integrated circuit 320 mm high-purity quartz projects were designated as Jiangsu Provincial Science & Technology Support achievements. We continuously innovate large-diameter 520 mm quartz capabilities with over RMB 5M invested annually in testing hardware.
Rigorous Multi-Axis Inspection
Every quartz window destined for the European Union undergoes laser interferometry for surface flatness, ultrasonic flaw detection for internal bubble bubbles/striae, and polarized strain evaluation to guarantee uniform stress relief post-annealing.
Reinforced Adriatic Export Packing
Fragile quartz optic plates and sight glasses are individually enveloped in anti-scratch high-density EPE foam, moisture-barrier sealed, and secured inside fumigation-free ISPM-15 plywood crates designed to absorb transit impacts via air express or Mediterranean maritime freight.
Complete Drawing Customization
OEM/ODM processing to exact technical CAD drawings: waterjet rough slicing, CNC diamond edge chamfering, hole coring, optical slotting, steps, metallic sputtering (anti-reflective AR coatings), and high-vacuum CF/NW metal flange brazing.
Rapid Two-Hour Response Time
Our dedicated bilingual technical engineering desk replies to inquiries, standard bids, and custom specification requests within 2 hours, sustaining a verifiable 50% repeat procurement rate across our international clientele.
EU Regulatory & REACH Compliance
100% compliant with EU RoHS and REACH stipulations. Non-hazardous, environmentally inert, and accompanied by formal certificates of origin, physical property specification sheets, and mill test inspection reports.
Buyer Knowledge Base
Frequently Asked Questions for Split Procurement Teams
Technical and logistical clarifications for engineering consultants, naval dockyard purchasers, and laboratory managers across Split and Dalmatia.
What parameters determine the required thickness of a quartz window for pressurized marine vessels?
Window thickness calculation depends primarily on three variables: unsupported diameter (clear aperture), maximum operating/test pressure (bar or MPa), and an application-specific safety factor (typically 4 to 10 for critical maritime or boiler observation ports). The baseline equation utilized is:
t = 0.5 × d × √((1.06 × P × SF) / σ)
where d is clear diameter, P is hydrostatic pressure, SF is the design factor, and σ is the apparent tensile strength of fused quartz (~48 MPa). Our engineering office assists Split clients in sizing and calculating exact thicknesses to guarantee compliance with DNV-GL, Lloyd's Register, or Bureau Veritas inspection rules.
t = 0.5 × d × √((1.06 × P × SF) / σ)
where d is clear diameter, P is hydrostatic pressure, SF is the design factor, and σ is the apparent tensile strength of fused quartz (~48 MPa). Our engineering office assists Split clients in sizing and calculating exact thicknesses to guarantee compliance with DNV-GL, Lloyd's Register, or Bureau Veritas inspection rules.
How does VEZLO safeguard fragile quartz plates against transit damage during shipping to Split?
Transit across international hubs into Split Airport (SPU) or Port of Split requires engineered protective packaging. We utilize a multi-layer isolation strategy: each quartz sight glass is individually inspected, dust-sealed in PE wrapping, cushioned within custom high-density expanded polyethylene (EPE) nests, and boxed into heavy-wall corrugated cartons. These cartons are placed inside exterior, impact-damped, ISPM-15 compliant export plywood crates fitted with drop and tilt indicators. Broken-on-arrival rates remain under 0.1%.
Can fused quartz withstand direct contact with hot saline sea mist or sulfuric flue gas?
Yes. Transparent fused quartz is chemically inert to almost all acidic solutions and saline vapours, making it vastly superior to metal alloys or soda-lime glass in coastal Adriatic marine applications. It is unaffected by sulfuric acid, nitric acid, hydrochloric acid, and heavy maritime exhaust gases up to 1,000°C. The only chemicals that attack quartz at ambient or elevated temperatures are hydrofluoric acid (HF), concentrated hot phosphoric acid (>150°C), and strong hot alkaline solutions.
What is the lead time for custom CNC laser-cut or ground quartz viewports shipped to Croatia?
Standard prototype and custom-dimension cut plates (such as specialized observation discs or step-ground rectangular sight glasses) typically require 7 to 12 working days in factory production. International priority air transit (via DHL Express, FedEx, or UPS direct to Split or Zagreb hubs) takes approximately 3 to 6 business days. For volume industrial production runs, combined sea-air or containerized multimodal logistics are coordinated to optimize landed cost.
Do you accommodate custom OEM labeling, beveling, and specific surface polish grades (Scratch-Dig)?
Yes. We regularly supply European clients with customized surface quality finishes: commercial polish (80/50 scratch-dig) for industrial boilers, precision optical polish (60/40 or 40/20) for laser apertures, and super-polish (20/10 scratch-dig with Ra <0.5 nm) for scientific spectroscopy. We also perform edge beveling (0.2–0.5 mm × 45° chamfers to prevent chipping), diamond step-grinding, surface serialization, and custom barcoded packaging per your warehouse intake protocols.
What trade terms and payment guarantees are supported for Croatian buyers?
We operate flexibly under standard Incoterms 2020 including EXW, FOB (Shanghai/Qingdao), CIF (Port of Split/Rijeka), and DAP directly to your manufacturing facility address. Secure transaction methods include Telegraphic Transfer (T/T), Irrevocable Letters of Credit (L/C at sight), and Alibaba Trade Assurance, which guarantees complete payment protection from production inception through final logistics confirmation.