Noise and thermal insulation

Enhanced glazing: best thermal insulation, self-cleaning glass or even solar protection!

Double glazing window improve the visual and thermal comfort of your home. They resist wind loads, operating forces and give protection against noise. Having two panes of glass fulfils all the expectations of a house owner by excluding noise, moisture, and pollution.

The advantages of Double glazing window include the greater security they provide by making it twice as difficult for burglars to break in. Additionally the companies also provide glazing services and solutions for your double glazing problems. These windows are available in multi-light options with internalized steel and aluminum reinforcement.

Coatings are applied to glass to enhance glazing with special properties such as thermal insulation, self-cleaning and solar protection features. These coatings can be added online or offline.

Online coatings

Online coatings are applied directly to glass during production, before the glass has cooled. The coating is applied by vaporising a chemical compound over the semi-molten glass.
The online process, known as CVD (Chemical Vapour Deposition) is the more traditional form of applying coatings but the process cannot be used for applying all types of compounds. Another problem with the traditional form of online coating is that it cannot be applied with the same precision possible in the latest offline processes. The metallic layers in online coated glass are therefore thicker which gives the finished glass a slight tint - making white curtains, or white Georgian bars, appear grey. The online coating process can also cause small indentations on the surface of the glass before it sets, which gives doucle glazing window a ‘hazy’ or dusty looking appearance.
Online coatings are, however, highly durable and especially suitable for use where coatings are positioned on face 1 (the exterior facing outside pane) – such as for self-cleaning glass.

Offline coatings

Offline coatings are added after the basic float (or annealed) glass has been manufactured and cut. Offline coatings were previously considered less resistant but latest techniques now use a magnetron coater which results in an exceptionally durable coating, which can even be heat treated for toughening.
The magnetron coater uses a technique known as sputtering to apply layers of metal oxide to the glass under vacuum conditions. This offline process allows a much wider range of formulas to be used, including those with reflective properties needed for solar protection and the most energy effective forms of Low E glass. The result is a microscopically thin layer of coating which gives the glass superior clarity and transparency.
Below is a comparison of two Low E glasses – one which has been manufactured online and one using the offline magnetron coater process. You will see that the offline coated glass has a much more neutral, transparent appearance.
All offline coatings are produced on a magnetron coater. It is the developments in the coatings which makes them more durable.

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