Capillary Tubes  Manufacturers, Traders, Suppliers

We custom produce high precision glass capillary tubes, with different size of inner diameter holes. Based on fiber drawing technology, we can achieve various geometric sizes and specifications of precision circular glass capillaries. With CNC machine tools for batch cutting, after strict annealing and end face precision grinding processes, precision circular glass tubes and special-shaped glass tube products are obtained.Product Features
• Accurate geometric indicators and good batch consistency
• High purity quartz material, high temperature resistance, corrosion resistance, high transparency, and good electrical insulation
• Hardness=Mohs 7, low coefficient of thermal expansion
• Many possible materials
• Custom dimensions tailored to your application
Product Applications:
• Combiners, Fiber pigtail, collimator, CWDM, CCWDM, DWDM collimator, CWDM, CCWDM DWDM
• Optical communication packaging sleeve/Optical Fiber Sleeves, all glass structured optical device
• Laser medical glass tube
• Biophotonics
• Fiber Fusion Cone
Material Properties of Quartz Glass
Chemical Properties
Quartz glass is a material with excellent chemical stability. It has outstanding resistance to water. And it resists both dilute and concentrated acids comparatively well, even at elevated temperatures (up to about 100℃), relative to other current commercial glasses. There are the only exceptions of hydrofluoric acid (which already reactsat room temperature) and phosphoric acid (at temperatures above 200℃). Quartz glass shows only a limited resistance to alkaline solutions, particularly at elevated temperatures.
Mechanical Properties
Quartz glass is a hard and brittle material with low tensile strength and high compressive strength, with compressive strength being 20 times that of tensile strength.
Thermal Properties
Quartz glass resists to high temperature to above1000℃, and it has very good thermal shock resistance, it is a poor conduct or heat.
Electrical Properties
Clear quartz glass is one of the best electrically insulating substances, suitable particularly for applications at higher temperatures. Its surface electrical conductivity is very low, since it is not hygroscopic and no water film layer containing eluted alkalis is formed on its surface, as happens with conventional silicate glasses. Clear quartz glass also has a high electrical disruptive strength and low dielectric losses, even at elevated temperatures.
Optical Properties
An important difference between quartz glass and ordinary glass is its good transmittance throughout the entire spectrum, especially in the ultraviolet and deep ultraviolet spectra, which is not possessed by general optical glass. There are different cutoff wavelengths in the ultraviolet band, and hydroxyl groups produce deep absorption peaks in the infrared band.
Radiation Resistance
Compared with ordinary glass, quartz glass has excellent radiation resistance. Among them, synthetic quartz glass has the best radiation resistance and hardly produces color centers.

Product Parameters
Parameters：Glass capillary tubes
Material：Quartz or borosilicate glass
OD (mm)：0.1≤D≤10
OD & ID tolerance：±0.05 or higher
OD / ID ratio：1.1 to 15
Length (mm)：50 to 1500
Density (g/cm3) 20℃：2.2
Coefficient of thermal expansion （1/K）25-300℃：0.56*10-6
Softening Point (℃)：1670
Annealing Point (℃)：1210
Deformation Point (℃)：1110
Note: The indicators such as concentricity and end face perpendicularity are specified in the drawings. Accepting customization of other specifications and irregular glass tubes

High purity Capillary Quartz Tubes (or Quartz/Glass Capillary Tubes) with its optical, physical, mechanical, electrical, and other outstanding features, are widely used in optical fiber and communication industry such as PLC Splitter, Wavelength Division Multiplexer (WDM), Fiber Optic Sensor (FOS), Fiber Optic Sensors, Optical Fiber Communication Systems and other optical fiber transmission facilities. Quartz Capillary Tubing is the essential component and required material of the Gas Chromatographs, High Performance Capillary Electrophoresis Chromatograph (HPCE), High Performance Liquid Chromatograph (HPLC) and Micro fluidics instruments in Electronic, Medical Treatment, and Optical industry.