Synthesized from high-grade natural and synthetic silicon dioxide (SiO₂ ≥ 99.99%), our precision product lines serve liquid chromatography, spectrophotometry, crystal growth, and industrial thermal processing across global research and OEM assembly facilities.
Constructed with an ultra-dense, bubble-free inner layer formulated specifically for silicon crystal pulling and metallurgy melting without structural thermal degassing.
Heavy-wall transparent fused silica furnace tubes offering continuous operation up to 1100°C and peak stability to 1450°C for semiconductor diffusion and sintering.
Optical fused-quartz absorption cells engineered for UV-Vis spectrophotometry with a standard 10mm light path and non-reactive PTFE fluoropolymer stoppers.
Direct-melt bonded cuvettes featuring optical grade transparent windows for multi-angle fluorometry, marked with laser-etched alignment indices and blue storage cases.
High-purity light guide rods finished with 90° perpendicular optical flat cuts and flame-polished circumferences for efficient laser transmission and fiber coupling.
High-purity micro-porous opaque fused silica sheets delivering superior thermal insulation, high infrared scattering, and resistance to aggressive chemical etching.
Precision ground and fire-polished fused silica bars sustaining continuous 1100°C environments, used in chemical apparatus, sight gauges, and high-temp support fixtures.
Custom-welded ozone-free double-bore quartz tubing suited for high-density infrared emitters, continuous UV photolysis reactors, and specialized analytical flow loops.
Optical flow cells are mission-critical fluidic-photometric interfaces in High-Performance Liquid Chromatography (HPLC), Ultra-High Performance Liquid Chromatography (UHPLC), dynamic light scattering (DLS), and automated continuous flow chemistry. Achieving accurate absorbance linearity and high signal-to-noise ratios requires strict adherence to thermo-mechanical and optical manufacturing criteria.
Standard commercial cuvettes frequently rely on optical adhesives to bond quartz plates together. In analytical chromatography, organic solvents such as acetonitrile (ACN), tetrahydrofuran (THF), and methanol leach monomers from epoxies, generating ghost chromatographic peaks and UV baseline drift.
Our Donghai manufacturing facility applies Direct Molecular Fusion Bonding (Diffusion Bonding). Under extreme cleanroom conditions, polished quartz plates (surface flatness λ/4) are placed in optical contact and sintered at 1150°C. The silica crystal lattices fuse across the interface without adhesives, producing an integrated flow cell impervious to all acids and organic solvents.
Total internal reflection and optical scatter within flow cell channels attenuate beam intensity, increasing photometric noise. Our computer-controlled Double-Sided Chemical Mechanical Polishing (CMP) achieves surface roughness Ra < 0.5 nm (Scratch-Dig 10-5 per MIL-PRF-13830B).
Window parallelism is held within ≤ 15 arcseconds, preventing refractive divergence when working with monochromatic laser illumination or narrow-slit DAD (Diode Array Detectors).
Microbubbles trapped within detection chambers disrupt refractive pathways, causing sudden absorbance spikes and false chromatographic peaks. Our engineers utilize precision laser micro-machining and CNC ultrasonic boring to produce flow cell channels with parabolic entrance funnels and tapered Z-path geometry.
These hydrodynamic channels maintain laminar flow velocities up to 10 mL/min, sweeping dissolved micro-bubbles through the detection volume without dead zones, eddy currents, or analyte back-mixing.
Procurement teams across analytical instrumentation, biopharma manufacturing, and environmental monitoring face tightening regulatory tolerances and shifting supply-chain fundamentals. We track and accommodate key industry shifts to support your long-term sourcing roadmap.
Modern bio-separations and capillary electrophoresis require micro-flow cells with path lengths of 1mm to 50mm combined with internal volumes under 2 μL. High optical clarity coupled with sub-millimeter boring demands raw synthetic quartz (JGS1) to prevent UV solarization down to 190 nm. Suppliers capable of sub-micron CNC milling and diffusion sealing are capturing market share over standard cuvette fabricators.
Process analytical technology (PAT) is expanding from laboratory benches directly into continuous pharmaceutical manufacturing lines. Industrial flow cells must endure continuous pressures exceeding 80 bar and resist thermal shock during CIP/SIP (Clean-In-Place / Steam-In-Place) protocols at 135°C. Fused quartz with thermal expansion coefficients of 5.5 × 10⁻⁷/°C outperforms sapphire-composite alternatives on cost and thermal shock resistance.
Supply disruptions in refined quartz sand have emphasized the advantage of geographic proximity to raw quartz reserves. Sourcing flow cells directly from manufacturers situated in Donghai County—China's crystal capital—secures raw material quality, avoids intermediate broker markups, and cushions OEM buyers from volatile international supply chains.
Selecting the appropriate material grade ensures that your photometric instruments deliver accurate quantitative data without optical saturation or baseline cutoff.
| Material Grade | SiO₂ Purity | Transmission Band | Hydroxyl (OH⁻) Level | Autofluorescence (365nm) | Primary Industrial Use |
|---|---|---|---|---|---|
| JGS1 Synthetic Fused Silica | ≥ 99.9999% | 185 nm – 2500 nm | < 5 ppm to 1200 ppm (Opt) | Extremely Low / None | Deep UV Spectrometry, HPLC DAD, Flow Cytometry |
| JGS2 Optical Fused Quartz | ≥ 99.99% | 220 nm – 2500 nm | < 30 ppm | Low | Standard UV-Vis Cuvettes, Light Guides, Viewports |
| JGS3 Infrared Optical Quartz | ≥ 99.99% | 260 nm – 3500 nm | < 5 ppm (Water-free) | Moderate | FTIR Flow Cells, Infrared Pyrometry, Laser Windows |
| Standard Technical Quartz | ≥ 99.9% | 260 nm – 2000 nm | 100 – 200 ppm | Moderate to High | Furnace Diffusion Tubes, Crucibles, High-Temp Rods |
| Borosilicate 3.3 Glass (Ref) | ≈ 81% | 310 nm – 2200 nm | N/A (Multi-oxide) | Noticeable | General Laboratory Glassware, Sight Windows |
Founded in 2011 in Donghai County, Lianyungang, Jiangsu, Donghai Kemzo Quartz Products Co., Ltd. operates as a vertically integrated manufacturer and exporter recognized as an official Jiangsu High Technology Enterprise and certified to ISO 9001 standards.
Donghai holds China's highest-density natural crystal reserves. Our close integration with primary refining lines grants us unmediated access to natural quartz sand with total metallic impurities below 15 ppm. Every flow cell and furnace tube batch carries spectroscopic traceability back to raw feedstock lots.
Whether your assembly calls for standard 10mm rectangular cuvettes, double-flanged diffusion tubes, or sub-microliter microfluidic flow chips with integrated capillary connectors, our engineering office confirms technical drawings and tolerance limits within 1 hour. Prototyping ships in as few as 7 business days.
Every optical flow cell undergoes spectrophotometric transmission scans across 190–1100 nm, laser interferometric surface roughness evaluation, and high-pressure helium leak detection. Parts pass through Class 1,000 cleanroom ultrasonics and hermetic vacuum packaging before crating.
Exporting more than 70% of our annual production to North America, Europe, East Asia, and Oceania, we support FOB, CFR, CIF, EXW, DDU, and DAF terms. Precision optical glassware travels in impact-absorbent molded EVA foam encased in reinforced marine-grade export wooden crates.
Direct answers to the most common optical, mechanical, and commercial questions raised by laboratory engineers and procurement managers.
Send us your dimensional drawings, target path length, and working fluid parameters. Our senior optics engineers will review tolerances, propose the most economical manufacturing process, and deliver a formal quotation within 1 hour.