Vacuum insulated glazing is one of the best-documented glazing technologies of the last thirty years. This page collects the standards it is measured against, the UK rules that apply, and the peer-reviewed research — each with a plain-English note and a link to the original.
The short version, in plain English — each statement links to the study or standard behind it. The full detail follows below.
The performance is real — and independently measured.
The best vacuum units reach triple-glazing U-values, and that is not just the makers talking: labs have measured whole units two separate ways to confirm the numbers stand up.
Behind itSimko, Elmahdy & Collins (1999) — U-value measurement ↗
The vacuum holds for years.
The University of Sydney group that invented vacuum glazing showed the sealed vacuum stays stable over time, and later work models exactly how the sealing method sets its service life.
Behind itCollins & Simko (1998) — foundational review ↗ · Koebel et al. (2010) — service-life model ↗
There is no mystery about where the last bit of heat escapes.
The only heat paths left once the air is gone — the tiny support pillars and the sealed edge — have been measured and modelled precisely for more than 25 years.
Behind itWilson, Simko & Collins (1998) — pillar conduction ↗ · Simko & Collins (1995) — edge conduction ↗
It's a standardised product, not a lab curiosity.
Vacuum glass has its own international standard, ISO 19916, defining how it is specified and tested — the same kind of rulebook any serious building product carries.
Behind itISO 19916-1:2018 ↗
Independent bodies back it up.
It is not only the manufacturers: US national labs have modelled it, and Historic Environment Scotland found vacuum glazing the best-performing slim option for traditional windows.
Behind itLBNL — Arasteh, Selkowitz & Wolfe (1989) ↗ · Historic Environment Scotland — Technical Paper 9 ↗
Vacuum glass has its own international standard, ISO 19916 — it is not covered by EN 1279, the standard for conventional double glazing.
The foundational product standard for VIG. Defines the unit and its components (glass, pillars, edge seal, port, getter), how U-value and sound insulation are calculated, and the dimensional tolerances. Adopted in the UK as BS ISO 19916-1:2018.
Test methods for how a rigid-edge-sealed VIG behaves when the two panes are at different temperatures — the thermally induced stress that is a key durability concern for frit-sealed units.
Still a working draft, not yet published — intended to cover mechanical behaviour (pillar-array stress, edge seal, wind and thermal loading). No publication year should be cited yet.
The standard for conventional sealed insulating glass units. Its scope explicitly excludes vacuum glass — which is exactly why ISO 19916 exists. A VIG unit cannot be "EN 1279 certified"; that is the wrong standard, not a shortcoming.
China's national product standard for VIG. As the largest VIG manufacturing base, much of the vacuum glass sold worldwide — including into the UK — is made to this standard.
Two regimes matter: Building Regulations (thermal performance) and heritage consent (for listed buildings and conservation areas). They are separate, and both can apply.
Replacement windows in existing homes must reach a U-value no worse than 1.4 W/m²K, or a Window Energy Rating of Band B (new-build windows: 1.2). Vacuum glazing clears this comfortably.
Guidance (not product "approval") on when slim-profile and vacuum glazing can be fitted into historic frames — generally acceptable where there is no historic glass of interest, no leaded lights, and the glazing bars are substantial enough.
Research with Heriot-Watt University on the thermal performance and embodied energy of slim-profile options for historic windows — and it found vacuum double glazing the best-performing of them.
A reminder: Historic England publishes guidance, not blanket product endorsements. No manufacturer is "approved by Historic England" — acceptability is decided case by case by the local conservation officer.
A curated, verified reading list — from the foundational University of Sydney work to recent reviews on low-carbon buildings. Titles, authors and links are as published; follow each link for the full paper.
The foundational review from the University of Sydney group that invented VIG — construction, heat-flow mechanisms, and evidence the internal vacuum stays stable over years. The paper the whole field builds on.
Analyses heat loss through the rigid edge seal — the "edge effect" that limits whole-window U-values and drives how VIG units and sightlines are designed.
Quantifies conduction through the tiny support-pillar array — one of the two dominant residual heat paths in VIG, alongside radiation.
Measures a 1 m² VIG by two independent methods (guarded hot box and hot plate), validating lab measurements against full-size standard test conditions — how VIG gets rated.
Early Lawrence Berkeley work on very-high-R glazing, foundational context for the US highly-insulating-window programme that later modelled VIG.
The theory for a three-pane, two-vacuum-gap unit, showing centre-of-glass U-values well below single-gap VIG — and the mechanical trade-offs involved.
Validates a finite-element heat-transfer model against measured VIG, giving the modelling toolset used across much later VIG design work.
Shows where simplified 2-D models are enough and where full 3-D modelling of the pillar array and edge seal is needed for accurate U-value prediction.
Simulates triple VG with one to four low-E coatings; cutting coating emittance from 0.18 to 0.03 drops centre-of-glass U-value from ~0.41 to ~0.22 W/m²K — a clear demonstration of the coating’s role.
Develops a sub-200 °C composite edge seal so delicate soft low-E coatings survive fabrication; a prototype triple VG reached ~0.33 W/m²K. A key edge-seal advance.
An Empa durability study modelling how cavity pressure rises over time from outgassing and permeation, linking sealing method to expected service life — central to longevity claims.
Shows sunlight (UV) can release adsorbed gas inside the cavity — a real-world degradation pathway that informs the use of getters and the ISO 19916 durability requirements.
A widely cited review comparing VIG technologies and commercial products by U-value, light transmittance and manufacturability — a good single-source overview.
A recent comprehensive review (PolyU/LBNL authors) covering materials, fabrication, modelling and performance evaluation, framed around low-carbon buildings.
A Seoul National University review of transparent vacuum-insulation technology aimed at carbon-neutrality goals — useful recent framing of where the field is heading.
A UK-specific retrofit simulation: fitting triple VG to a solid-wall house sharply cuts space-heating demand versus single and conventional glazing — directly relevant to UK homes.
Sources are provided for transparency and further reading. Descriptions are our own plain-English summaries; refer to each original paper for the authoritative detail. Listing here is not endorsement by the authors of this site.
