Many of us are interested in restoring old windows. But how many of us know the fascinating journey of glass windows through time? Although most people don’t give it much thought, glass windows are one of the most essential parts of a home. They allow us to connect with the outside world visually. They brighten living and working spaces and enhance the beauty of not only the exterior of a building but also the inner space. Perhaps the greatest benefit of glass windows is their ability to improve the mood and well-being of their building occupants.
Glass is inorganic and can be molded into many shapes. It is usually transparent or opaque. Glass is created by applying high heat to sand or quartz until it is molten. It makes an excellent medium for opening up spaces with light when used for partitions, doors or windows. As opposed to very early windows made of paper, glass windows repel water and protect a building’s interior during inclement weather.
In order to fully appreciate glass windows, you need to understand their history and how they came to be one of the most common elements of homes and buildings today.
Glass is one of the most versatile – and most misunderstood – materials used in the world. Glass can be used for everything from eyeglasses to bottles, windows to the ‘glassphalt’ you find on the road. Many products called “glass” are actually ceramics and have entirely different manufacturing process than the glass we discuss in this article. Glass that is put into buildings or automobiles, in windows or table tops is usually called flat-, float-, window or plate glass. So exactly what is glass?
The ancient Romans made flat glass by rolling out hot glass on a smooth surface. The resulting glass was neither clear nor even, but it was good enough to use in windows of the day. In fact, glass was quite a luxury at the time and only the nobility could afford it. By 1668, the French company Saint-Gobain had perfected a “broad glass” method of manufacture that involved blowing long glass cylinders, slitting them and unrolling them to form an almost-flat rectangle. This plate glass was then ground and polished on both sides.
By the late 1800s, glass was being made by blowing a very large cylinder and allowing it to cool before it was cut with a diamond. After being reheated in a special oven, it was flattened and affixed to piece of polished glass which preserved its surface. In 1871, a gentleman named William Pilkington invented a machine that allowed larger sheets of glass to be made. It was the first of a number of marvelous glass-related inventions to come from the Pilkington family.
It may seem like a simple question with it a simple answer, but it’s not. Glass is one of the most versatile—and misunderstood—materials in the world. Glass can be used for everything from windows to “glassphalt”, from eyeglasses to bottles.
In fact, lots of materials called glass are actually ceramics and have an entirely different manufacturing process. Here, we discuss glass that is put into buildings and vehicles, which is glass made by the float process. That is why it is generally called float glass. Float glass sometimes is also known as flat glass (though it isn’t always flat), or plate glass.
The ancient Romans made glass by blowing air through a very large cylinder and allowing it to cool, then cutting it with a diamond. The resulting glass was neither clear nor even, but it was good enough to be used in windows of the day.
In 1668, the French company Saint Gobain perfected a “broad glass” method of manufacture that involved blowing long glass cylinders slitting and unrolling them to form a nearly flat rectangle. This glass was then ground and polished on both sides.
By the late 1800s, new additives were mixed in. and glass was now re-heated after manufacture in a special oven, then flattened and affixed to a piece of polished glass which preserved its surface.
In 1871, William Pilkington invented a machine that allowed larger sheets of glass to be made. It was the first of many ingenious glass-related inventions to come from the Pilkington family.
By the early 1900s most glass was manufactured using the sheet glass method—through which a ribbon of glass was drawn from a tank furnace between cooled rollers. It produced a less expensive, albeit imperfect window.
Manufacturing processes did not change much until 1959 when another Pilkington by the name of Sir Alistar invented the float glass process. It changed glass manufacturing forever. In the float glass process, a continuous strip of molten glass at approximately 1000 degrees centigrade is poured continuously from the furnace onto a large shallow bath of molten metal, usually tin.
The glass floats and cools on the tin and spreads out to form a flat surface. The speed at which the controlling glass ribbon is drawn determines the thickness of the glass. Glass is much less expensive to produce via the flat process than any other type of process. Today more than 90 percent of the world’s flat glass is made via the float process.
Float glass is very versatile as well. Add silver backing to it and you have created a mirror, heat and then cool the glass very quickly in a special oven and you have made tempered glass. Your windshield is really a “glass sandwich” called laminate glass, made of two pieces of float glass with a plastic interlayer between them. And if you seal two pieces of glass with an airspace between them, you have created insulating glass.
Learn more about the Float Glass Process today.
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