Why is it beneficial to have a capillary tube made of glass?

Benefits of Glass Capillary Tubes

Glass capillary tubes are widely used in various scientific and medical fields due to their unique properties and benefits. These tubes, often made from special types of glass, offer several advantages over those made from other materials like plastic or metal. Below are detailed explanations of their benefits:

Chemical Inertness

Glass is highly resistant to chemicals, making it an ideal material for capillary tubes that need to come into contact with aggressive substances. This chemical inertness ensures that the glass does not react with the substances it encounters, preventing contamination and preserving the purity of samples.


The transparency of glass allows for the visual inspection of the contents within the capillary tube. This is particularly beneficial in medical and laboratory settings where observing the flow of liquids or the presence of certain elements within the tube is necessary.

Thermal Stability

Glass has excellent thermal stability, meaning it can withstand high temperatures without deforming or losing its structural integrity. This property is crucial for applications that involve heating or cooling the contents of the capillary tube.


The smooth and uniform inner surface of glass capillary tubes enhances capillary action, allowing for the efficient movement of small volumes of liquid. This is essential for precise measurements and analyses in fields such as chemistry and medicine.


Glass can be easily shaped and customized into various sizes and forms, making it possible to produce capillary tubes that meet specific requirements. This flexibility in design allows for the creation of tubes that are perfectly suited for particular applications.


Being non-toxic and biocompatible, glass capillary tubes do not induce adverse reactions when in contact with biological samples. This makes them safe for use in medical applications, including those that involve direct interaction with human tissues or fluids.

Durability and Reusability

Although glass is perceived as fragile, certain types of glass used in capillary tubes are quite durable and can withstand repeated use. This durability, combined with the ability to sterilize glass tubes, makes them reusable, offering cost-effectiveness over time.


In summary, glass capillary tubes offer a combination of chemical inertness, transparency, thermal stability, enhanced capillarity, customizability, biocompatibility, and durability. These properties make them indispensable tools in scientific research, medical diagnostics, and various industrial applications.

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