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All About Borosilicate Glass Tubes

If you are looking for glass tubes for sale, borosilicate alias Pyrex should be what you need! Borosilicate glass tubes are a unique type of glass made of boron trioxide and silica. These are two major constituents in any borosilicate glass tube. What makes the borosilicate glass tubes special would be its low coefficient of thermal expansion. This makes the glass tubes highly resistant to chemicals and thermal shock. When compared to traditional glasses, borosilicate is highly resistant to thermal shock and harsh chemicals. In the past few years, several different types of borosilicate glass tubes have surfaced. Trade names like Simax, DURAN, Borcam, and Schott specialize in borosilicate glass tubes.

The history of Borosilicate glass

The world’s first borosilicate glass was made in the 19th century. The glass was founded by Otto Schott. In the year 1893, borosilicate glass was sold under the brand name DURAN. Borosilicate glass tubes are a mix of three major ingredients: aluminum oxide, quartz, and sodium carbonate. These are three important ingredients in any glassmaking procedure. However, to manufacture borosilicate glass, another interesting ingredient is added! And, that would be “boron”. With respect to composition, borosilicate glass is 80% silica, 3% aluminum, 4% sodium oxide and 13% boric oxide. Though borosilicate oxide is expensive, it is extremely durable and strong. It shows superior signs of resistance to heat and chemicals. Thus, borosilicate oxide is an ideal form of glass in any chemical laboratory.

The Manufacturing Procedure

Borosilicate glass tubes are carefully prepared using soda ash, boric oxide, alumina, and silica. The ingredients are melted and mixed together. Borosilicate glass has a higher melting point. Thus, it takes more time to melt than ordinary silica. As a part of the industrial production, new methods need to be used for melting borosilicate glass.

The manufacturing process of borosilicate glass strongly depends on the geometry of the product. And, it is quite easy to differentiate procedures like molding, floating and tube drawing.  

Physical Properties of Borosilicate Glass tubes

As mentioned previously, borosilicate glass has a low coefficient of thermal expansion. When compared to soda lime glass, the thermal coefficient of borosilicate glass tubes is three times more. This is why borosilicate glass exerts lessor stress due to temperature gradients. If you are ought to engage in lab experiments, borosilicate glass tubes are what you need.

Fused quartz-ware are believed to have a thermal expansion coefficient that is 15-times lower than soda lime glass. Unfortunately, fused quartz-ware is more expensive to produce. When it comes to price, borosilicate glass tubes are cheaper.

However, one should remember that borosilicate glass tubes may crack when temperature variations to extremely uneven. And, when temperature variations are extremely rapid, borosilicate glass is likely to shatter! This is something you should watch out for!

A Quick Summary

On the whole, borosilicate glass tubes have the following properties:

  1. These glasses can handle a wide range of thermal coefficients.
  2. Borosilicate glass tubes can be directly sealed with other alloys and metals.
  3. Borosilicate glass can be heated to a maximum temperature of 932 Fahrenheit.