Fused Quartz Capillary Tubes

Short Description:

Fused quartz capillary tubes are precision-engineered microtubes made from high-purity amorphous silica (SiO₂). These tubes are valued for their outstanding chemical resistance, exceptional thermal stability, and superior optical clarity across a wide spectrum of wavelengths. With internal diameters ranging from a few microns to several millimeters, fused quartz capillaries are extensively used in analytical instrumentation, semiconductor manufacturing, medical diagnostics, and microfluidic systems.

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Features

Detailed Diagram

Overview of Quartz Capillary Tubes

Unlike ordinary glass, fused quartz offers ultra-low thermal expansion and high-temperature endurance, making it suitable for harsh environments, vacuum systems, and applications involving rapid temperature cycling. These tubes maintain dimensional integrity and chemical purity even under extreme thermal, mechanical, or chemical stress, enabling precise and repeatable performance across industries.

Manufacturing Process of Quartz Glass Sheets

The production of fused quartz capillary tubes requires advanced precision fabrication techniques and high-purity materials. The general manufacturing workflow includes:
1. Raw Material Preparation
  High-purity quartz (typically JGS1, JGS2, JGS3, or synthetic fused silica) is selected based on application needs. These materials contain over 99.99% SiO₂ and are free of contamination like alkali metals and heavy metals.
2. Melting and Drawing
  Quartz rods or ingots are heated in a cleanroom environment to over 1700°C and drawn into thin tubes using micro-drawing machines. The entire process is carried out under controlled atmospheres to avoid contamination.
3. Dimensional Control
  Laser-based and vision-assisted feedback systems ensure accurate control of inner and outer diameters, often with tolerances as tight as ±0.005 mm. Wall thickness uniformity is also optimized during this stage.
4. Annealing
  After forming, tubes undergo annealing to remove internal thermal stress and improve long-term stability and mechanical strength.
5. Finishing and Customization
  Tubes can be flame-polished, beveled, sealed, cut to length, or cleaned depending on customer specifications. Precision end finishes are essential for fluid dynamics, optical coupling, or medical-grade applications.

Physical, Mechanical & Electrical Properties

Property	Typical Value
Density	2.2 g/cm³
Compressive Strength	1100 MPa
Flexural (Bending) Strength	67 MPa
Tensile Strength	48 MPa
Porosity	0.14–0.17
Young’s Modulus	7200 MPa
Shear (Rigidity) Modulus	31,000 MPa
Mohs Hardness	5.5–6.5
Short‑Term Maximum Use Temperature	1300 °C
Annealing (Strain‑Relief) Point	1280 °C
Softening Point	1780 °C
Annealing Point	1250 °C
Specific Heat (20–350 °C)	670 J/kg·°C
Thermal Conductivity (at 20 °C)	1.4 W/m·°C
Refractive Index	1.4585
Coefficient of Thermal Expansion	5.5 × 10⁻⁷ cm/cm·°C
Hot‑Forming Temperature Range	1750–2050 °C
Long‑Term Maximum Use Temperature	1100 °C
Electrical Resistivity	7 × 10⁷ Ω·cm
Dielectric Strength	250–400 kV/cm
Dielectric Constant (εᵣ)	3.7–3.9
Dielectric Absorption Factor	< 4 × 10⁻⁴
Dielectric Loss Factor	< 1 × 10⁻⁴

Applications

1. Biomedical and Life Sciences

Capillary electrophoresis
Microfluidic devices and lab-on-a-chip platforms
Blood sample collection and gas chromatography
DNA analysis and cell sorting
In vitro diagnostics (IVD) cartridges

2. Semiconductor and Electronics

High-purity gas sampling lines
Chemical delivery systems for wafer etching or cleaning
Photolithography and plasma systems
Fiber optic protection sheaths
UV and laser beam transmission channels

3. Analytical and Scientific Instrumentation

Mass spectrometry (MS) sample interfaces
Liquid chromatography and gas chromatography columns
UV-vis spectroscopy
Flow injection analysis (FIA) and titration systems
High-precision dosing and reagent dispensing

4. Industrial and Aerospace

High-temperature sensor sheaths
Capillary injectors in jet engines
Thermal protection in harsh industrial environments
Flame analysis and emissions testing

5. Optics and Photonics

Laser delivery systems
Optical fiber coatings and cores
Light guides and collimation systems

Customization Options

Length & Diameter: Fully customizable ID/OD/length combinations.
End Processing: Open, sealed, tapered, polished, or beveled.
Labeling: Laser etching, ink printing, or barcode marking.
OEM Packaging: Neutral or branded packaging available for distributors.

FAQ of Quartz Glasses

Q1: Can these tubes be used for biological fluids?
Yes. Fused quartz is chemically inert and biocompatible, making it ideal for applications involving blood, plasma, and other biological reagents.

Q2: What is the smallest ID you can manufacture?
We can produce inner diameters as small as 10 microns (0.01 mm), depending on the wall thickness and tube length requirements.

Q3: Are quartz capillary tubes reusable?
Yes, provided they are cleaned and handled correctly. They are resistant to most cleaning agents and autoclave cycles.

Q4: How are the tubes packaged for safe delivery?
Each tube is packaged in cleanroom-safe holders or foam trays, sealed in anti-static or vacuum-sealed bags. Bulk and protective packaging for fragile sizes is available upon request.

Q5: Do you offer technical drawings or CAD support?
Absolutely. For custom orders, we provide detailed technical drawings, tolerance specifications, and design consultation support.

About Us

XKH specializes in high-tech development, production, and sales of special optical glass and new crystal materials. Our products serve optical electronics, consumer electronics, and the military. We offer Sapphire optical components, mobile phone lens covers, Ceramics, LT, Silicon Carbide SIC, Quartz, and semiconductor crystal wafers. With skilled expertise and cutting-edge equipment, we excel in non-standard product processing, aiming to be a leading optoelectronic materials high-tech enterprise.