What is the diameter of glass capillary?

Diameter of Glass Capillary

The diameter of a glass capillary refers to the internal width of the tube, which is crucial for its capillary action. Capillary tubes are thin, hollow tubes made of glass and are used in various scientific and medical applications. The diameter of these tubes can vary widely depending on their intended use.

For instance, Hampton Research's Glass Number 50 Capillaries are designed for crystallography applications and have specific dimensions tailored for this purpose. The diameter of these capillaries is critical for the precise control of liquid movement and the formation of crystal structures within the tube.

Typical Diameter Range

The diameter of glass capillaries can range from less than a millimeter to several millimeters. The choice of diameter depends on the application, including the volume of liquid to be handled, the required capillary action, and the size of particles or crystals to be accommodated.


  • Scientific Research: For experiments requiring precise liquid handling.
  • Medical: In microsampling and as part of medical devices.
  • Industrial: In the manufacturing of sensors and other precision instruments.

In summary, the diameter of a glass capillary is a key characteristic that determines its functionality and suitability for specific applications. It is selected based on the requirements of capillary action, liquid volume, and the physical properties of the substances to be handled.

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