The Double Glazing Gap – What's In It?


As manufacturers and installers will tell you, there must be space between the two panes in double glazing. The why is pretty obvious: to reduce heat loss and improve thermal insulation. However, what is happening inside the spacer has been the subject of curiosity from some homeowners. What is inside the double glazing?

Special gases in high-end double glazing

High-end windows do not only use expensive materials; they also use special gases to fill the cavity.

Argon-filled glazing is by far the most common and practical choice in the high-end category. The gas is non-reactive and abundant. Its high density and natural ability to withstand the flow of air make the thermal insulation very effective.

Xenon, krypton and glazing filled with sulfur hexafluoride can do an even better job than argon with thermal insulation. Special gases facilitate heat transfer between the poles, which reduces the heat that escapes from the window.

Dry air in standard double glazing

Meanwhile, conventional double-glazed windows and secondary glazing use dry air to fill the void, hence the familiar term "air gap ".

Air is a composite mixture of several gases, including oxygen, nitrogen, carbon dioxide and trace elements of argon, helium and other elements. For the air to be considered "dry", the amount of water vapor and moisture must be drastically reduced to 40% below normal numbers.


It is essential to keep the air dry in double glazing to prevent moisture buildup inside the interstice. Maintaining the desired moisture levels is often achieved by preventing outside air from mixing with dry air and by using desiccants to absorb moisture within the interior of the home. l & # 39; spacer.

During the manufacturing process, companies must ensure that the desiccant does not come into contact with outside air. To allow this way would significantly shorten the shelf life of the desiccant and impact its ability to prevent condensation.

There are several types of desiccants that your double glazing supplier could use: common silica gel, calcium oxide, calcium sulphate or molecular sieve (industry experts say it's the best performing variety for technical applications).

Spacer Bar

Finally, the last thing you will notice in the spacer is the bar "an internal frame responsible for maintaining a constant distance between the two sheets of glass.

Contrast at the ordinary bar, foam spacers instead of metal.Thus, you can expect a better sound absorption performance to complete the insulating properties of double glazing.


Source by Sarah Clark

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