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Pilkington Spacia™: Revolutionary vacuum glazing | Pilkington

Pilkington Spacia™: Revolutionary vacuum glazing | Pilkington

Advanced Pilkington Spacia™ technology is the World’s first commercially available ‘Vacuum Glazing’. It provides a similar level of energy efficiency as modern double glazing, but in a unit that is typically only a quarter of the thickness. This brings a new degree of thermal performance to older buildings and opportunities for thin glazing in new buildings. Pilkington Spacia™ offers a real solution to the problem of balancing historical preservation with modern comfort and environmental requirements. It may even allow the use of the original frames as well as authentic copies and in most cases, can be used in secondary glazing applications.

The importance of energy-efficient glazing

Advances in technology have made windows a significant contributor to the energy efficiency of new homes. Current restrictions, which were put in place to preserve the character of the nation’s buildings, in some circumstances prevent the improvement of thermal efficiency by not permitting upgrading from single glazing. So, whilst these properties look appealing, they carry a heavy price in terms of reduced internal comfort levels, high heating costs and carbon footprint. Pilkington Spacia™ vacuum glazing can provide a huge step change in window energy efficiency in older properties without sacrificing the style and appearance of the window frames.

How it works

Pilkington Spacia™ vacuum glazing consists of an outer pane of low-emissivity glass and an inner pane of clear float glass, separated by a micro spacer grid of small pillars each measuring just 0.5 mm diameter, set 20 mm apart, which are robotically positioned, with ‘intelligent’ camera checking. This grid ensures that the two glass panes are kept a fixed distance apart. The edges are welded to achieve a hermetic seal. Air is extracted to create a vacuum via the extraction point, rather than being air or gas filled. The result is an excellent thermal performance from a unit that is only slightly thicker than single glass.

Pilkington Spacia™: Revolutionary vacuum glazing | Pilkington

A new level of performance for older buildings

Pilkington Spacia™ provides similar energy efficiency performance as a high-performance standard double glazed unit containing a low-emissivity glass, such as product from the Pilkington K Glass™ range, but in a much thinner profile. It is therefore perfectly suited for use in original, refurbishment or new thin profile frames, allowing the property to maintain its original appearance. Pilkington Spacia™ provides a cost-effective method of improving the energy efficiency of older properties where glazing choice is restricted, or where the original frames are a desirable feature.

  • Pilkington Spacia™ has five times better thermal insulation than single glazing with a Ug-value of 1.1 W/m²K, helping to reduce heat loss from the property
  • Suitable as a replacement for single glazing in original frames, to retain the appearance of older traditional buildings
  •  Can be used in secondary glazing applications for enhanced thermal performance
  • Reduced interior noise levels of Rw (C; Ctr) 35 (-1;-3) dB when compared to 29 (-2;-3) dB for 4 mm single glazing
  • Internal condensation risk levels are significantly reduced when compared to single glazing
  • Pilkington Spacia™ Opaque version is available where privacy is required


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The challenge of replacing windows in #heritage & #listedproperties is addressed by @Gowercroft MD Andrew Madge in @ArchitectsDF

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