Manufactured in Lianyungang's world-leading silica industrial cluster. From raw mineral refining to five-axis diamond CNC micro-machining, explore our benchmark fused silica and quartz window products.
Semiconductor wet cleaning pipelines, hot-zone welding, precision bent fluid channels with extreme thermal shock resistance.
Optically polished threaded sight tubes offering premium corrosion resistance, high tensile strength, and RoHS material compliance.
200 Mesh 75m annealed at 1200°C. Engineered for precision medical optics, laser aperture guidance, and chromatography.
Engineered for GentleYag/GentleMax aesthetic lasers. Flawless flow dynamics, extreme beam transmission, and zero bubble count.
Specialized dielectric envelopes for industrial ozone generators, corona discharge tubes, and high-intensity infrared heaters.
RoHS-certified 99.99% silica furnace tubes and visual observation ports with near-zero thermal distortion at continuous 1100°C.
Double-sided optical lapping and polishing. Perfect for deep-UV spectrophotometer sight windows and digestion lab apparatus.
Complete custom quartz engineering: chemical vapor deposition (CVD) tubes, quartz bubblers, flanged sight glasses, and wafer boats.
Based in Tuofeng Industrial Park, Lianyungang, our state-of-the-art workshop integrates complete production chain autonomy: from raw lump crush and acid-purification to high-precision CNC finishing.
Unlike assembly workshops, we operate proprietary pulverizing, rescreening, and ultrasonic multi-stage acid pickling lines to purge trace metallic contaminations before melting.
Thermal fatigue and catastrophic window failure stem from residual stresses. Every optical blank undergoes 1200°C programmed continuous annealing and 100% polariscope extinction verification.
Equipped with specialized 4-axis and 5-axis CNC machining stations, grinding, bevelling, countersinking, multi-step bore coring, and wafer slotting within ±0.005mm tolerances.
Onsite assessed by SGS Group, verified by Alibaba TrustPass, and certified for RoHS & CE compliance. Full export crate packaging guarantees global safe transit with zero micro-fractures.
Selecting the appropriate grade of fused silica or fused quartz window is critical for performance reliability and cost management. While all three main grades share identical mechanical and thermal benefits (near-zero expansion of 5.5×10⁻⁷/°C and thermal survival past 1100°C), their internal microstructure and manufacturing methodologies dictate their transmission bands:
| Physical / Optical Parameter | Fused Quartz Window Standard | Standard Borosilicate Glass |
|---|---|---|
| Silica Purity (SiO₂) | ≥ 99.99% | Approx. 80.5% |
| Spectral Range | 185 nm – 3500 nm (JGS1/JGS3) | 320 nm – 2000 nm |
| Thermal Expansion (20-300°C) | 5.5 × 10⁻⁷ / °C | 32.5 × 10⁻⁷ / °C |
| Continuous Service Temp | 1100 °C | 450 °C |
| Maximum Shock Gradient | 1100°C into cold water: NO CRACK | Cracks above 150°C gradient |
| Dielectric Strength (20°C) | 25 – 40 kV/mm | 15 – 20 kV/mm |
| Mohs Hardness | 5.5 – 6.5 | 5.0 – 5.5 |
As semiconductor wafer fabrication nodes shrink below 3nm and high-power industrial fiber lasers surge past 30kW, the procurement criteria for fused quartz windows are shifting:
1. Strict Trace Contaminant Mitigation: Semiconductor fabs and advanced thin-film PV manufacturers now demand inductively coupled plasma mass spectrometry (ICP-MS) reports confirming trace metallic ions (Fe, Cu, Ni, Na, K, Li) remain below parts-per-billion (ppb) thresholds to eliminate atomic vapor contamination during wafer thermal processing.
2. Large-Aperture Monolithic Sight Windows: The rise of 800V silicon carbide (SiC) and gallium nitride (GaN) crystal growth reactors requires thicker, large-diameter fused quartz vacuum viewports capable of sustaining severe mechanical loads alongside 1300°C internal heat spikes without surface devitrification.
3. Dual-Wavelength Anti-Reflective Coatings: Industrial purchasers are prioritizing pre-coated quartz blanks finished with hard ion-beam sputtering (IBS) coatings that withstand corrosive HF/CF₄ plasma etching environments while delivering >99.5% optical transmittance at designated operating wavelengths.
The global optics and material fabrication industries are investing in higher-performing quartz composites and processing techniques to accommodate rigorous operating conditions:
Key considerations when preparing inquiries, specifying tolerances, and selecting optical glass grades for custom manufacturing orders.
We routinely deliver optical surfaces to MIL-PRF-13830B standards (from commercial 60/40 to laser-grade 20/10 and 10/5 scratch/dig). For semiconductor lithography and laser transmission, double-sided optical polishing yields a surface roughness Ra < 0.5nm with flatness up to λ/10 per inch measured by Zygo laser interferometry.
Devitrification occurs when amorphous fused silica transitions into crystalline cristobalite above 1150°C, accelerated by alkaline surface contaminants (such as fingerprints or dust). Lovri operates multi-stage ultrasonic cleanroom acid washing lines (Class 1000) and vacuum sealing to ensure our products ship free of surface crystallization seeds.
Yes. Our in-house engineering team handles standard 2D drawings (DWG, DXF, PDF) and native 3D files (STEP, IGES, SolidWorks). We mill custom sight windows with complex stepped flanges, mounting countersinks, O-ring seal grooving, laser-drilled micro-apertures, and sandblasted frosted edges to your precise tolerances.
Fused silica has a compressive strength of roughly 1100 MPa, vastly higher than its tensile strength (approx. 48 MPa). For vacuum chamber viewports and deep-sea sight glasses, thickness is calculated using standard Clavarino formula models with minimum safety factors of 4 to 6. Our team reviews your pressure differential and provides structural recommendations.
Every commercial production run includes a Certificate of Conformance (CoC), spectrometer UV-Vis-NIR spectral transmission curves, polariscope residual stress inspection logs, and raw material chemical purity reports detailing SiO₂ concentration and ppm trace elements. RoHS and REACH compliance certificates are included as standard.
Products are wrapped individually in anti-static, dust-free pouches, placed within custom cut-out polyethylene (PE) high-density foam sleeves, and packed into reinforced export cartons or fumigated wooden crates. With shipments delivered to over 40 countries, our transit-breakage rate remains under 0.05%.