How are glass windows made?
user
Generally, in modern windows, the glass is made in special factories. The shape and size are usually dictated by the architecture of the building. The glass is loaded on large trucks and sent to the factory for processing. Some small companies still make windows by hand but they are usually expensive.
assistant
Is the glass made from sand?
user
No, glass is made by combining silica and lime, usually in large furnaces.
assistant
What is silica?
user
Silica is a chemical compound that occurs in nature. It is also used to make artificial glass.
assistant
Is silica mined?
user
Not usually, because the silica itself is not very valuable. Silica is found in sandstone, or fused as volcanic glass. It is important for glass production because it is often combined with lime to make glass.
assistant
So how is silica and lime turned into glass?
user
In glass manufacturing, silica is combined with lime to create a mixture called "frit". The frit is fed into the top of a tank where it is melted to a very high temperature and the molten glass is then poured out of the bottom of the tank and into its final form, for instance a window. The temperatures reached are so high that the glass is very stable and doesn’t break easily.
assistant
Are windows tempered?
user
Yes, in some cases, depending on the type of window, it is necessary to temper the glass to make it more resistant to breakage.
assistant
And how is glass tempered?
user
In some cases, it is heated, cooled, and reheated many times so that the temperature fluctuation is "tempered" in a sense. Tempering is done so that the glass has a lower tendency to break.
assistant
How are glass windows made?
user
Generally, in modern windows, the glass is made in special factories. The shape and size are usually dictated by the architecture of the building. The glass is loaded on large trucks and sent to the factory for processing. Some small companies still make windows by hand but they are usually expensive.
assistant
Is the glass made from sand?
user
No, glass is made by combining silica and lime, usually in large furnaces.
assistant
What is silica?
user
Silica is a chemical compound that occurs in nature. It is also used to make artificial glass.
assistant
Is silica mined?
user
Not usually, because the silica itself is not very valuable. Silica is found in sandstone, or fused as volcanic glass. It is important for glass production because it is often combined with lime to make glass.
assistant
So how is silica and lime turned into glass?
user
In glass manufacturing, silica is combined with lime to create a mixture called "frit". The frit is fed into the top of a tank where it is melted to a very high temperature and the molten glass is then poured out of the bottom of the tank and into its final form, for instance a window. The temperatures reached are so high that the glass is very stable and doesn’t break easily.
assistant
Are windows tempered?
user
Yes, in some cases, depending on the type of window, it is necessary to temper the glass to make it more resistant to breakage.
assistant
And how is glass tempered?
user
Tempering is done by cooling the glass slowly. The cooling process makes the glass stronger. Tempering is done in the second stage of glass production, where the glass is formed into the shape of the window.
assistant
How are glass windows made?