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12/03/26

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Glazing: Heart of PVC Window

The insulating glass unit (IGU) is the central element of a PVC window, directly determining the comfort and energy efficiency of a room. It’s not just glass — it’s a sophisticated multi‑layer structure that reliably isolates the home from the outside world.

A typical IGU consists of two or three glass panes (referred to as “glass sheets”) separated by spacer bars. The spaces between the panes (chambers) may be filled with dry air or an inert gas — for instance, argon. The gas enhances thermal insulation properties: its thermal conductivity is lower than that of air, so heat stays inside during winter and is kept out during summer.

The spacer bar not only sets the distance between the panes but also contains a desiccant — a substance that absorbs residual moisture. This prevents fogging and condensation inside the IGU. The glass panes themselves can vary: they may be standard, energy‑saving (with a low‑emissivity coating), noise‑reducing or even impact‑resistant.

IGU thickness varies: from 24 mm for basic solutions to 40–50 mm for enhanced insulation. The more chambers and thicker the panes, the better the protection against cold and noise. For example, a double‑chamber IGU (three panes) significantly outperforms a single‑chamber one in terms of heat retention.

The longevity of the unit depends on build quality: sealed joints and reliable spacer bars prevent depressurisation and extend the service life to 20 years or more. A well‑chosen IGU will not only retain heat and shield against street noise but also reduce heating and cooling costs — a true investment in comfort and savings.


 

 

 

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