Vacuum Glazing (VG) is an advanced window technology featuring two panes of glass separated by a tiny, sealed gap (typically 0.3mm to 1.0mm) from which almost all air is evacuated, creating a vacuum cavity. Tiny spacers or pillars are used to maintain the separation.

Key Difference: Traditional Double Glazing (DG) uses a wider gap (typically 10 mm to 20 mm) filled with an inert gas (like argon or krypton) or just air. The vacuum in VG virtually eliminates heat transfer via convection and conduction, which is much more effective than the gas in DG.

Vacuum glazing offers significantly better thermal performance, resulting in a much lower U-value. 

U-Value Comparison: 

Standard DG (Air/Argon fill): Typically 1.2 to 2.0 W/m²K.

High-Performance VIG: Can achieve U-values as low as 0.4 to 0.8 W/m²K, which is comparable to, or even better than, modern high-spec triple glazing.

Benefit: This superior insulation leads to greater energy savings, reduced reliance on heating and cooling systems, and a more stable internal room temperature.

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