High-Purity Quartz Glass Products & Vacuum Viewports
Manufactured from optical-grade natural quartz and high-purity synthetic fused silica. Available with precision double-side surface polishing (λ/10 flat), laser-grade chamfering, and custom broadband anti-reflective (AR) coatings.
Ultra-High Purity SiO₂ Raw Material
Continuous Operational Heat Resistance
Scratch-Dig Precision Surface Quality
Engineering Technical Response Time
Engineered for Coimbra's Advanced Science & Industrial Sectors
From fundamental photochemistry research at the University of Coimbra to industrial bioprocessing in the Cantanhede and Mealhada technology corridors, our high-transmission optical windows satisfy critical European experimental benchmarks.
Ultraviolet & Deep-UV Spectroscopy
Institutes and physical-chemistry laboratories across the Centro region rely on synthetic fused silica viewports (Corning HPFS 7980 and JGS1 equivalents) achieving > 90% internal transmittance at 193 nm and 260 nm for continuous laser diagnostics and precision fluorescence spectrophotometry.
Biopharmaceutical Synthesis & Autoclaves
In Biocant Park and surrounding biomedical manufacturing hubs, our inert quartz sight glass discs are installed within chemical synthesis vessels and autoclaving columns, offering uncompromising resistance against severe nitric, hydrochloric, and organic solvents.
High-Vacuum Laser & Plasma Viewports
Featuring low coefficient of thermal expansion (5.5 × 10⁻⁷ /°C) and wave-front distortion below λ/10, our optical quartz windows withstand extreme thermal gradients inside vacuum chambers, pulsed-laser deposition systems, and high-temperature tube furnaces.
Fused Quartz vs. Synthetic Fused Silica Parameters
Understanding substrate distinctions ensures maximum performance in UV ablation, thermal imaging, and physical vapor deposition systems.
| Technical Characteristic | Optical Fused Quartz (JGS2) | Synthetic Fused Silica (JGS1) | Impact on Optical System Design |
|---|---|---|---|
| SiO₂ Purity Level | ≥ 99.99% | ≥ 99.9999% | Eliminates heavy metal fluorescence in high-gain sensor arrays. |
| Transmission Bandwidth | 260 nm – 2500 nm | 185 nm – 2500 nm | Prevents solarization when subjected to deep-UV excimer laser exposure. |
| Refractive Index (nd @ 589.3 nm) | 1.4585 | 1.4584 | Ensures predictable focal length and dispersion management. |
| Surface Flatness & Roughness | λ/4, Ra < 1.0 nm | λ/10, Ra < 0.5 nm | Limits optical wave-front distortion and unwanted laser scatter. |
| Thermal Shock Resistance | 1100 °C water quench safe | 1150 °C water quench safe | Withstands localized thermal heating from high-power pulsed beams. |
Donghai Kemzo Quartz: Direct Source Manufacturing Advantages
Combining primary mineral reserves from China's quartz capital with state-of-the-art optical grinding, fire-polishing, and CNC processing.
Certified ISO 9001 Production
Continuous traceability from pristine quartz crystal feedstock to finished, cleanroom-bagged optical flats and sight windows.
Custom OEM to Drawing
Over 11 years of export mastery. We fabricate bespoke diameters, custom step-profiles, bevels, and multi-slot furnace carriers with tight millimeter tolerances.
Zero-Stress Annealing
Precision thermal-cycle annealing furnaces eliminate residual birefringence, preventing catastrophic mechanical failure under high vacuum pressures.
Export Logistics to Portugal
Multi-layered bubble suspension, vapor barrier sealing, and rigid export-grade wooden cases guarantee zero transit micro-fractures to Coimbra via Porto or Lisbon hubs.
Frequently Asked Questions by Research & Industrial Buyers in Coimbra
Direct answers addressing import customs, technical verification, and material compliance for European laboratories and industrial developers.
How can research institutions in Coimbra request custom quartz windows with specific AR coatings?
What documentation is provided to satisfy European research compliance and customs clearance?
Which quartz grade is recommended for high-temperature sight glasses in tube furnaces?
What are the standard delivery lead times and packing safety standards for delicate optics shipping to Portugal?
Accelerate Your Photonics, Research & Furnace Projects
Connect directly with our senior quartz fabrication engineers. Send your dimensional tolerances, material requirements, or drawing specifications for a rapid review and formal quote within 1 hour.