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Varieties of window glass

When replacing windows or doors, people can often overlook the various types of glass used in product construction.
Choosing the right kind of glass for your project can be crucial if you are to get the best out of the selection on offer. It is not simply a matter of choosing which type of glass is the cheapest. And the problem today is that there are just so many different types of glass on offer it can be tricky to make the right decision.
At the forefront is the question of the insulating properties of different glass types, as this can be a major factor when it comes to heating bills.
Other types of glass can protect against harmful ultraviolet rays. Some glass treatments can let the light in and keep the heat out. Some types of glass will offer a greater level of security while others help keep out noise.
It is a matter of weighing up all the options and reaching a balance between the benefits and the costs. Here we explain the various types of glass to help you make the right decision.

Plate glass

Plate glass is widely used in the building of homes and offices. Sometimes called float glass or rolled glass, it is usually made from silica with additives such as lime and magnesium and aluminium's oxides, while aluminium is added to lower the melting point and improve strength. Often called a soda-lime glass, it accounts for around 75% of all glass production.
The Pilkington Brothers in the UK introduced the 'float glass' method of production that floated the molten glass on a bed of molten tin to output good quality sheets of plate glass, free from distortion. Cheap, transparent, colourless and available in large, thin sheets, float glass or plate glass has become the standard basic material for architectural and building work. Thicker sheet glass tends to become light green in colour.

Tinted glass

Tinted glass is made by adding coloured pigments during the manufacturing process. It can be used for design or aesthetic reasons but, as more colour is added, it reduces light. Standard colours for tinted glass are grey, blue and bronze and may be used on roof skylights, vehicles or screen panels. Strong tints or thick glass not only cut the amount of light transmitted, but they also increase the heat absorption, so tinted glass panels can become very hot and may need to be toughed if panes are not to get overstressed and break.

Laminated glass

One of the main disadvantages of sheet glass is its brittleness. Glass is hard but is easily fractured and, when broken, splits into many sharp fragments. Laminated glass was developed to counteract this and offer a more robust material with all the properties of normal glass but is much harder to break.
Laminated glass also has the benefit of not breaking up into small shards. It is made by fusing two panes of glass bonded around an inner layer of a polyvinyl compound. Laminated glass, sometimes called 'safety glass', not only offers greater durability, but it can also reduce noise and give higher thermal protection. It is often used for shop windows, secure buildings as it stays intact even when broken.

Toughened glass

Toughened glass is often mistaken for laminated glass, but there are important differences between the two. It is not just differences in manufacture that separates them; they have distinctive properties that make tithe more or less suitable for various applications.
Toughened glass, sometimes called tempered glass, is a high strength material made by heating glass to a very high temperature then rapidly cooling it. The rapid cooling compresses the glass surface to create a strong outer layer that makes tempered glass up to five times stronger than normal glass. Toughened glass is used in products that require both strength and resistance to heat, such as shower cubicles, splashbacks and protector screens.

Reflective glass

As more glass is used in buildings, they developed problems with dissipating the heat produced by strong sunshine. Also called solar control glass, reflective glass can be clear or tinted and has a thin layer of metal oxide applied to the surface.
Available in an array of tints, it reduces the solar heat while allowing most of the visible light to pass through unimpeded. Solar glass units are usually double glazed, so they have good insulation against heat and noise. In sunny weather, it reduces the heat gain in a room and in cloudy weather it allows the maximum level of natural light.

Low-E glass

This type of glass is a high tech product that allows light to pass through but reflects heat, so indoor spaces stay light but remain temperate in any weather conditions. The low-E stands for 'low emissivity' and combine high heat insulation with relatively high visibility. Thus letting light through but not heat.
Low-E glass has a transparent metallic coating that reflects longer wavelength heat-carrying light without impeding short-wavelength natural light. It works in both directions, reflecting heat back into the room on cool, winter nights. The drawbacks are a slight green/blue tint and a lack of durability. As coatings are very thin, they can be easily scratched during window installation or deteriorate over time. They are also more expensive than other glass windows.

Frosted glass

This type of glass is textured or patterned after manufacture using a variety of etching or sandblasting techniques. Designs can also be 'imprinted' into the heated glass using patterned rollers or etched into the glass with acidic chemicals.
Frosted glass panels admit plenty of natural light but obscure the view by limiting the transparency. They are frequently used on bathroom windows or areas that require both light and privacy. The decorative patterns are useful for special features such as glass door panels or statement windows.

Insulated glass

This is not really a type of glass as pretty much any glass can be used in panels that are double glazed or triple glazed. Panes of glass are sandwiched in layers with spaces filled with an inert gas such as argon. Panels sometimes include a desiccant to prevent condensation from forming between the panes. Double and triple glazed units are thermally efficient and form a noise barrier.

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