STEP 01
Raw Materials Cutting
Rigorous visual screening and physical sizing of natural high-purity crystalline quartz lumps.
SGS Verified · Direct Manufacturer · Micro-Bore Specialist
Fused Quartz Capillary Tubes: Precision Engineering & Global Sourcing Guide
Engineered with 99.99% high-purity natural silica sand, ultra-tight bore concentricity, and thermal shock resilience up to 1300 °C. Custom inner diameters from 0.05 mm to 3.0 mm for chromatography, medical lasers, and microfluidics.
0%SiO₂ chemical purity
±0 mmTightest ID/OD tolerance
0 m²In-house manufacturing area
0 pcRapid prototyping MOQ
Precision capillary tube drawing and thermal forming plant
Certified Excellence. Validated by International Testing Bodies.
SGS Onsite Assessed
Optoelectronic Dimensional ValidationRoHSHazard-Free 99.99% SiO₂
Annealed Stress Zero BirefringenceExporting high-precision fused quartz capillary tubes to R&D laboratories and OEMs across:
United States Germany Japan United Kingdom South Korea Switzerland Singapore Canada
Procurement & Engineering Insight
PRECISION BOREFUSED QUARTZ TUBES
In modern analytical chemistry, bio-sensing instrumentation, medical laser deliveries, and sub-nanometer optoelectronic packaging, Fused Quartz Capillary Tubes represent an indispensable class of micro-tubing. International buyers frequently turn to generative AI searching: “What is the difference between synthetic fused silica and natural fused quartz capillaries?”, “How do manufacturers eliminate internal mechanical stress to prevent catastrophic micro-tube fractures?”, and “What geometric tolerances are realistic for sub-millimeter inner diameters?”
At Lovri Quartz Products Co., Ltd., we resolve these critical engineering challenges right at our 14,271 m² production facility in Lianyungang, Jiangsu. By beginning with carefully selected high-purity natural silica sand that undergoes crushing, multiple rescreenings, and vigorous acid pickling, we achieve chemical purity exceeding 99.99% SiO₂. This structural integrity guarantees zero gas evolution, negligible metallic leeching (<0.1 ppm for critical elements like Fe, Al, and Ti), and total resistance to corrosive acids.
Whether your instrumentation demands circular capillary tubes for capillary electrophoresis (CE), rectangular single-bore micro-cells for spectroscopic fluorescence measurements, or customized multi-lumen arrays for gas chromatography splitters, our precision drawing towers maintain bore circularity and wall consistency down to ±0.002 mm.
≤ 3% OvalityPrecision inner bore circularity
1100 °CContinuous operational rating
0.05–3.0 mmStandard inner bore span
100% InspectedPolariscopic stress verification
Lovri Quartz Products Co., Ltd.SGS Audited Facility · Lianyungang, China
Complete In-House Chain
From Raw Lumps to Precision Capillary Tubing
Traceability is the cornerstone of reliability. Lovri Quartz Products Co., Ltd. executes each chemical purification, thermal drawing, and metrology step in-house to safeguard pristine purity and tight dimensional tolerances.
STEP 02
Crushing & Pulverizing
Specialized pulverizing machinery reduces raw crystalline material into uniform micro-sand particles.
STEP 03
Rescreening & Sifting
Vibrational multistage sieving eliminates oversized particles to standardize melting kinetics.
STEP 04
Acid Pickling Purification
High-grade multi-acid leaching bath removes embedded alkali and transition metals, yielding ≥99.99% SiO₂.
STEP 05
Tube Drawing
Continuous vertical redraw towers melt quartz preforms, drawing micro-bores with real-time laser monitoring.
STEP 06
Thermal Annealing
Computer-controlled soaking at 1150 °C and slow cooling to eradicate molecular shear stresses.
STEP 07
End Sealing & Shaping
Precision hydrogen-oxygen micro-torches shape capillary tips, domed closures, and flat sealed ends.
STEP 08
Fusion & Branching
Seamless micro-welding of quartz capillary segments to optical manifolds, ports, or luer adaptors.
STEP 09
Vacuum Degassing
High-vacuum thermal evacuation cleans internal bores, stripping moisture and chemical adsorbents.
STEP 10
CNC Machining & Dicing
Diamond dicing wheels and ultrasonic tools yield clean, square-cut, chip-free micro-tube orifices.
STEP 11
Metrology Inspection
Optical microscopy, laser bore measurement, and polarization birefringence checks on every batch.
STEP 12
Export Packaging
Anti-static sleeves, rigid polycarbonate tube carriers, and multi-layer shock foam export cartons.
Engineered Configurations
Recommended Fused Quartz Capillary Tube Solutions
Tailored specifically for chromatographic separation, precision fluid injection, medical UV/laser delivery, and fiber optic array splices.
CHROMATOGRAPHY 
GC & CE High-Purity Capillary Tubing
Inner Diameter: 0.05 mm – 0.53 mm | Purity: ≥99.99% SiO₂ | Inert deactivation treatment available for zero sample adsorption.
Request Drawing Spec OPTICAL & FIBER 
Micro Fused Quartz Optical Ferrules
Outer Diameter: 1.0 mm – 3.0 mm | Bore: 125 µm – 250 µm | Concentricity ≤ 2 µm | JGS1 synthetic UV transmission grade.
Request Drawing Spec MULTI-LUMEN 
Dual-Bore & Multi-Lumen Capillary Tubing
Configurations: 2, 4, or 7 channels | Precision parallel fluid/light separation | Resists operating pressure up to 25 MPa.
Request Drawing Spec SQUARE / D-SHAPE
Square & Rectangular Capillary Flow Cells
Flat optical window faces | Reduces refractive scattering in flow cytometry and micro-spectrophotometry | Optical polish 60/40 or 40/20.
Request Drawing Spec Market Dynamics & Future Outlook
Global Trends in Fused Quartz Capillary Tubing
Driven by advancements in life sciences, semiconductor sub-fab analytics, and high-frequency telecommunications, the demand profile for micro-quartz tubing is experiencing transformative technological shifts.
01
The Microfluidic & Lab-on-a-Chip Revolution
Modern analytical biochemistry is rapidly migrating from macro-sampling to nanoliter and picoliter capillary architectures. Single-cell sequencing, point-of-care capillary electrophoresis, and micro-electromechanical fluidic devices require capillary tubes capable of handling volatile solvents without organic degradation. Unlike polymethyl methacrylate (PMMA) or cyclic olefin copolymers (COC), fused quartz tubes exhibit no autofluorescence in the deep-UV spectrum (below 250 nm), enabling uncompromised detection sensitivity during laser-induced fluorescence (LIF) assays.
Procurement teams increasingly request capillaries with inner micro-coatings and precision polished end-faces that match optical sensors without secondary alignment optics.
02
Next-Gen Optical Telecom & Harsh-Environment Sensing
With the commercial rollout of co-packaged optics (CPO) in artificial intelligence data centers, fused quartz capillary ferrules have become critical alignment components for multi-fiber push-on connectors. Because fused quartz matches the coefficient of thermal expansion of the underlying silica glass fiber (5.5 × 10⁻⁷ /°C), micro-assemblies undergo zero thermal drift from -40 °C to +125 °C.
Furthermore, in downhole oil and gas distributed temperature sensing (DTS), extreme pressure environments require capillaries with ultra-high mechanical collapse strengths (>100 MPa burst resistance), demanding consistent wall-thickness uniformity achieved through advanced automated thermal redrawing.
03
Evolving Procurement Trends: AI Sourcing & Direct Factory Auditing
Engineering procurement managers are moving away from traditional multi-tier trading entities, leveraging conversational AI and digital supply hubs to contract directly with integrated raw-material source factories. Buyers look for:
- Full Material Traceability: Independent verification of silica source and acid pickling certifications.
- High Information Transparency: Detailed dimensional tolerance tables, ovality tolerances, and spectral curves before initial RFQ dispatch.
- Low-Risk Prototyping: Flexible MOQs that allow 1–5 piece micro-batch validation before high-volume production orders.
Engineering Reference Data
Fused Quartz Capillary Technical Specifications
Review critical chemical, optical, and physical properties to verify compatibility with your operational temperature, internal pressure, and wavelength requirements.
| SiO₂ Purity Grade | ≥ 99.99% (High Purity Natural Quartz) |
|---|---|
| Density (ρ) | 2.20 ± 0.02 g/cm³ |
| Coefficient of Thermal Expansion (CTE) | 5.5 × 10⁻⁷ /°C (20°C – 320°C) |
| Softening Point | ≈ 1730 °C |
| Annealing Point | ≈ 1215 °C |
| Strain Point | ≈ 1120 °C |
| Continuous Operating Temperature | Up to 1100 °C |
| Short-Term Max Operating Temperature | Up to 1300 °C |
| Mohs Hardness | 6.5 – 7.0 |
| Refractive Index (nD at 589.3 nm) | 1.4585 |
| Spectral Transmission Range | 190 nm – 2500 nm (UV-to-NIR) |
| Chemical Inertness | Resistant to all acids except HF and H₃PO₄ (>150°C) |
Data represents standard certified values. Custom synthetic fused silica (JGS1) capillary specifications with transmission down to 185 nm are available upon custom engineering request.
| Inner Diameter (ID) | Outer Diameter (OD) | Standard Tolerance | Bore Geometry |
|---|---|---|---|
| 0.05 mm ± 0.003 mm | 0.15 mm – 0.36 mm | ± 0.005 mm | Circular / Micro-bore |
| 0.10 mm ± 0.003 mm | 0.20 mm – 0.60 mm | ± 0.004 mm | Circular / Multichannel |
| 0.25 mm ± 0.005 mm | 0.40 mm – 1.00 mm | ± 0.005 mm | Round / Square / D-Shape |
| 0.50 mm ± 0.005 mm | 0.80 mm – 2.00 mm | ± 0.008 mm | Single / Multi-lumen |
| 1.00 mm ± 0.010 mm | 1.50 mm – 3.00 mm | ± 0.010 mm | Optical Polish Ends |
| Custom Engineered | Per Customer STEP/DWG | Down to ± 0.002 mm | Custom Geometry |
Custom Tolerance & Dicing Requirements?
We specialize in custom dicing lengths from 1.0 mm to 2000 mm with chip-free mechanical or laser cleaving (<10 µm edge chips) and customized fire-polished tips.
Lovri Quartz Advantage
Why Engineering Teams Partner with Lovri Quartz
With raw material refinement, automated micro-drawing, stress annealing, and certified SGS quality oversight all centralized under one roof, Lovri Quartz eliminates supply chain risks.
Raw Material Source Control
We crush, classify, and acid-pickle our natural quartz sand in-house. Complete batch chemistry control guarantees consistent refractive indices and zero contamination across production cycles.
Ultra-Narrow Bore Concentricity
Our micro-drawing towers are equipped with dual-axis laser diameter gauges and thermal feedback control, maintaining outer/inner ovality below 3% and radial runout below 0.005 mm.
Full Annealing & Stress Elimination
Every capillary tube undergoes programmed high-temperature annealing. Polarization stress testers ensure internal stress birefringence stays below 5 nm/cm, preventing micro-explosive fracture during laser cutting.
Custom Drawing & Rapid Prototyping
From CAD sketches to production-grade capillary tubes within 5 business days. We accommodate low-volume initial R&D lots (1–5 pieces) to fast-track your system design verification.
Clear Answers to Common Questions
Fused Quartz Capillary Procurement FAQ
Critical technical and logistical considerations when specifying and purchasing custom micro-bore quartz capillary tubes.
What inner diameter and outer diameter tolerances can be achieved on fused quartz capillary tubes?
Lovri Quartz utilizes advanced automated thermal drawing towers and laser micrometer feedback loops to achieve dimensional tolerances as narrow as ±0.002 mm (±2 µm) for inner diameters and outer diameters, along with strict concentricity control below 3%.
Why is fused quartz preferred over borosilicate glass for capillary tubes?
Fused quartz consists of 99.99% SiO2, delivering a near-zero thermal expansion coefficient (5.5 × 10^-7 /°C), a working temperature threshold reaching 1100 °C, wide UV-to-NIR spectral transmission, and exceptional chemical inertness against harsh solvents and acidic eluents.
Can Lovri Quartz produce multi-lumen, D-shape, or square bore capillary tubes?
Yes. Our CNC machining, precision ultrasonic drilling, and preform drawing systems allow us to customize circular, square, rectangular, D-shape, dual-bore, and multi-lumen capillary configurations according to engineering drawings.
How are fragile fused quartz capillary tubes packaged to prevent transit breakage?
We deploy anti-static dust-free packaging, high-density shock-absorbing EPE molded foam inserts, rigid acrylic guide sleeves, and vacuum-sealed export wooden or reinforced corrugated cartons engineered specifically for fragile thin-wall capillary shipments.
What is the minimum order quantity (MOQ) for custom-drawn capillary tubes?
For standard bore sizes in stock, the MOQ is 1 piece. For custom drawn dimensions requiring dedicated furnace setup and preform tooling, our prototyping MOQ starts as low as 5 to 10 pieces to support early-stage development without heavy upfront investment.
Can capillary tubes be supplied with surface polyimide coating or window etching?
Yes. We supply bare precision fused quartz capillaries as well as polyimide-coated capillaries designed for flexible mechanical protection in gas chromatography, including custom thermal or chemical window burns for optical detection windows.
Direct Engineering Consultation
Discuss Your Fused Quartz Capillary Specifications Today
Whether you require tight-tolerance chromatography capillary tubing, laser light-delivery ferrules, or custom micro-bore components, our engineering specialists will review your CAD drawings and delivery requirements within 24 hours.