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What Is Borosilicate Glass?

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In the late 19th century, German glassmaker Otto Schott first added boric acid to the traditional soda-lime glass composition to create the first borosilicate glasses, also known as soda-borosilicate glass.

 

Borosilicate glass is composed of

 

80% silicon dioxide

13% boron oxide

4% sodium oxide

2 - 3% Aluminum Oxide


Borosilicate glass is a type of glass whose main components are silicon dioxide and boron trioxide. It is known for being durable and very heat resistant. Unlike many other types of glass, it does not break under extreme temperature changes, making it the material of choice for a wide range of applications, from cookware to laboratory use.

High Borosilicate Glass Coffee Mug

 High Borosilicate Glass Coffee Mug

Borosilicate glass first appeared in the late 19th century. The composition is typically 80 percent silica, about 13 percent boron oxide, 4 percent sodium oxide and 2 to 3 percent aluminum oxide. The main difference between borosilicate glass and conventional glass is the substitution of sodium and lime with boron oxide in the manufacturing process. High borosilicate glass must contain at least 5% boron oxide, which helps to combine silicate, alumina and sodium oxide.


Advantages of borosilicate glass

It has a very low coefficient of thermal expansion, which allows it to resist thermal shock. Thermal shock occurs when temperature changes cause different parts of a substance to expand at different rates. The resulting stresses can cause the substance to break. The resistance of borosilicate glass to thermal shock means that temperature changes do not put much stress on the glass, so a hot borosilicate dish can be removed from the oven and placed on a cool counter without breaking.

Borosilicate glass is also free of lead and Bisphenol A, making it very safe for use as a mug. True borosilicate glass is actually safer than tempered soda lime glass, which is the reason many companies are currently using it for kitchenware.

High Borosilicate Glass Oil And Vinegar Bottle

 High Borosilicate Glass Oil And Vinegar Bottle

Is borosilicate glass safe?

Its main characteristic is that it does not expand as much as ordinary glass. Because of its low coefficient of thermal expansion, it has excellent resistance to thermal shock. In soda lime glass, the sodium atoms soften the glass, making it easier to mold. However, when the sodium atoms become hot, they vibrate and expand, which can break the glass. In borosilicate glass, softening is achieved by adding boron atoms, so less sodium is needed. As a result, it expands at only one-third the rate of soda-lime glass. This means that even if it experiences a sudden change in temperature, it will not break easily. In the very rare and extreme cases where it does break, it will break, but it is less likely to break ... compared to conventional soda lime glass. Even at high temperatures, the glass can be placed on a cool counter without breaking.

 


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