CAPILLARY 
Micro Capillary Quartz Tube (OD 1mm-3mm)
High precision glass capillary tubing for chromatography, fiber optic ferrules, medical diagnostics, and electronic probes.
Direct Factory Catalog
Precision Fused Quartz Tubes & Capillaries
Lovri Quartz Products Co., Ltd. provides clear and opaque fused quartz tubes fabricated from natural or synthetic high-purity SiO₂ (≥99.99%). Our tubing exhibits superior thermal shock resistance, excellent dielectric strength, and broad spectral transmission from UV to deep IR.
FURNACE TUBE 
Large Diameter Quartz Furnace Tube
Heavy wall fused quartz pipe engineered for high-temperature diffusion furnaces, sintering, and semiconductor CVD processing.
PRECISION 
Thin-Wall Capillary Quartz Tube
Manufactured with tight wall tolerances (±0.02mm), optimal for temperature sensors, laboratory micro-reactors, and optical systems.
OPTICAL 
Optical-Grade Capillary Quartz Tubing
Polished surface with superior optical clarity from ultraviolet to infrared bands. Resistant to solarization and micro-cracking.
HIGH PRESSURE 
Heavy-Duty Quartz Tube (100mm-300mm)
High mechanical strength and vacuum integrity. Ideal for chemical reactors, thermal oxidation equipment, and vacuum sight pipes.
POLISHED 
Clear Polished Open-End Quartz Tube
Flame and mechanical cut ends, annealed for low residual stress. Custom lengths and ground bevel options available upon request.
SEMICONDUCTOR 
Semiconductor Quartz Feed Pipe
Ultra-pure quartz glass with verified low metallic impurities. Engineered for semiconductor gas injection, wafer boats, and flanges.
LABORATORY 
Quartz Glass Chemical Reactor Tube
Corrosion-resistant quartz reaction tubes for laboratory pyrolysis, synthesis chambers, and corrosive acid heating environments.
OZONE TUBE 
High-Ozone Transparent Quartz Tube
Formulated for ozone generation dielectric barriers and germicidal UV units with high transmission at 185nm and 254nm.
UV SLEEVE 
UV Disinfection & Ozone Quartz Sleeve
One end closed or open cylinder options for municipal water purification, ballast water treatment, and industrial air treatment.
THREADED 
Threaded Screwed Quartz Tube
Precision-milled internal and external quartz threads. Designed for vacuum connections, detachable sensors, and analytical instruments.
HEATING 
Electric Heating Quartz Glass Sleeve
Heat-resistant quartz tubing with low expansion coefficient. Ideal envelope for carbon fiber, halogen, and medium-wave IR heating elements.
End-to-End In-House Manufacturing Capabilities
At Lovri Quartz Products Co., Ltd., we oversee every phase of quartz tube manufacturing in our 14,271 m² Lianyungang facility. From raw silica sizing to automated drawing and CNC post-processing, each step adheres to strict QA/QC standards.
1. Material Cutting
Raw natural quartz lumps are graded and sized for purer feedstock.
2. Acid Pickling
Multi-stage acid baths eliminate metallic traces, securing ≥99.99% purity.
3. Precision Drawing
Vertical and horizontal thermal pulling systems regulate OD and wall gauge.
4. Thermal Annealing
Controlled cool-down cycles eliminate internal stress to avoid cracking.
5. End Sealing & Shaping
Forming round, flat, or dome bottom tubes for vacuum and immersion uses.
6. CNC Machining
Precision drilling, slotting, external threading, and optical polishing.
7. Stress Inspection
Polariscope inspection ensures structural integrity under thermal loads.
8. Export Packaging
Shock-absorbing foam wrap and export-grade reinforced wooden crates.
Fused Quartz Glass Tube Technical Specifications
| Property | Technical Value | Application Significance |
|---|---|---|
| SiO₂ Purity | ≥ 99.99% | Prevents contamination in semiconductor diffusion & analytical chemistry. |
| Operating Temperature | 1100°C continuous / 1300°C short-term | Excellent for industrial furnaces, thermal reactors, and high-wattage lamps. |
| Coefficient of Thermal Expansion (CTE) | 5.5 × 10⁻⁷ cm/cm·°C (20°C - 320°C) | Extreme thermal shock tolerance: withstands rapid plunge from 1100°C to cold water. |
| Softening Point | ≈ 1730°C | Maintains rigid geometry under intense localized thermal heating. |
| Dielectric Strength | 25–40 kV/mm (at 20°C) | Reliable insulating material for ozone generators and plasma equipment. |
| Spectral Transmission | > 90% (260nm to 2500nm) | Maximum transmission for UV disinfection, photolithography, and IR heating. |