Hybrid vacuum glass
BENGglas Hybrid combines the strength of vacuum glass with an additional counter pane. In this way you achieve a very high insulation value, while existing window frames can simply be retained. The glass is matched to the available space in the profile: from narrow existing window frames to wide profiles in which extra glass thickness is possible. So you get the best possible insulation from your current window frames, without thick and heavy triple glass!
- Maximum insulation: from U=0.35, depending on the glass configuration
- Fits narrow and wide profiles: tailored to the available space in the existing frame
- Clever alternative to triple glazing: 2x better insulation without thick and heavy glass
- Extra insulation at the edges: less heat loss due to the extra counter pane and insulating spacer
- Less noise pollution: up to 41 dB noise reduction in the hybrid laminated variant
- Tested U-value: tested by IFT Rosenheim in 2025
Differences at a glance
| BENGglas | Double glazing | Triple glazing | |
|---|---|---|---|
|
U-value (W/m²K) |
>0,35 | 1,10 | 0,70 |
|
Thickness from (mm) |
6,7 | 21 | 38 |
| Fits existing window frames | Yes | Sometimes | No |
| Tempered |
Standard EN3569 Except for BENGglas 6,7 mm (half tempered) |
Optional | Optional |
|
Light Transmission (LTA in %) |
> 83 | 80 | 65 |
|
Solar Heat Gain (G-value) |
>0,33 | 0,76 | 0,52 |
|
Sound Insulation Rw (C;Ctr) dB |
36 (–2; –3) to 41 (-2;-6) for BENGglas Hybrid |
31 (-1;-4) | 33 (-2;-6) |
| Insulation degradation at horizontal tilt (%) | 0 | 60 | 40 |
| Expected lifespan (years) | 50 | 20 - 25 | 30 |
| U-value degradation over time? | No | Yes | Yes |
| BENGglas Extra clear | BENGglas Single Coated | BENGglas Double Coated | BENGglas Triple Coated | BENGglas Monu | BENGglas Monu Restover | BENGglas Solar Control | BENGglas SUN | |
|---|---|---|---|---|---|---|---|---|
|
U-value (W/m²K) |
0,50 | 0,40 - 0,50 | 0,40 | 0,35 | 0,50 | 0,50 | 0,50 | 0,50 |
|
Thickness from (mm) |
8,3 | 6,7 | 8,3 | 8,3 | 8,3 | 12 | 10,3 | 14 |
|
Maximum dimensions (in mm) |
2.350 x 4.150 | 2.350 x 4.150 | 2.350 x 4.150 | 2.350 x 4.150 | 2.350 x 4.150 | 1.500 x 2.500 | 2.350 x 4.150 | 1.500 x 2.500 |
| Light Transmission (LTA %) | 83 | 78 | 70 | 68 | 83 | 83 | 45-47 | Adjustable |
|
Solar Heat Gain (G) |
0,68 | 0,58 | 0,39 | 0,33 | 0,68 | 0,68 | 0,29 | Adjustable |
| Sound Insulation Rw (C;Ctr) dB |
36 (-2;-3) up to -41 dB (-2;-6) in the hybrid version |
36 (-2;-3) up to -41 dB (-2;-6) in the hybrid version |
36 (-2;-3) up to -41 dB (-2;-6) in the hybrid version |
36 (-2;-3) up to -41 dB (-2;-6) in the hybrid version |
36 (-2;-3) up to -41 dB (-2;-6) in the hybrid version |
39 (-2;-3) |
36 (-2;-3) up to -41 dB (-2;-6) in the hybrid version |
39 (-2;-3) |
| Properties |
Extra clear Extra thermal Extra light |
Clear Color-neutral glass Ultra thin: > 6,7 mm |
Solar control glass |
Best U-value Extra solar control Commercial buildling |
Heritage glass (light drawn) |
Heritage glass (strongly drawn) |
Solar control glass | Energy-generating glass |
References
Are you curious about where vacuum glass is already being applied? Check out our references and discover how BENG glass is being applied in all kinds of projects - from listed buildings and protected heritage sites to sustainable new construction, canal houses and sleek offices.
In this way, we are helping window by window to create energy-efficient buildings with fewer CO₂ emissions.
BENGglas Hybrid voor transformatie Universe | voormalig KPN gebouw
Sustainability of modern office building
Easily meet BENG standards with BENG glass!
Find a certified installer
BENGglas has an extensive network of over 150 certified installers across Europe, specializing in vacuum glass installations. This way, you’re always assured of a professional close to home! Want to get the best deal easily? Fill out our quote form and receive three competitive offers from the three nearest BENGglas dealers in your area!
Frequently asked questions
How thick is vacuum glass?
Vacuum glass varies in thickness depending on the brand you purchase. This can be as low as 6.7 millimeters for untoughened vacuum glass, but often the minimum glass thickness starts at 6.7 millimeters. Depending on the window area, this can go up to a minimum glass thickness of 16.3 millimeters.
The minimum glass thickness in BENG glass:
BENG glass's vacuum glass consists of two sheets 3, 4, 5 or 6 mm thick with a vacuum space of only 0.3 mm between them. This brings the minimum glass thickness to 6.7 millimeters (semi-tempered) or 8.3 millimeters for tempered vacuum glass.
Depending on the desired window area, the minimum glass thickness is determined.
The larger the pane, the thicker the structure must be to prevent deformation or warping:
- up to 3 m²: 6.7 - 8.3 mm
- from 3 to 4 m²: 10.3 mm
- from 4 to 4.8 m²: 12.3 mm
- from 4.8 m²: 16.3 mm
Since BENG glass is available up to 4,120 mm (where other vacuum glass brands can only produce up to 2,500 mm), it is possible that the pane thickness will be 16.3 mm.
Do you prefer thicker vacuum glass anyway?
BENG glass can be thickened or laminated. This means that either an extra pane or an extra cavity with pane is placed against the vacuum glass package. This increases the total thickness. Depending on the desired final thickness, we can fully customize the composition.
This way you are always assured that you can keep your window frames.
Not sure what thickness best suits your windows? We would be happy to help you! Be sure to contact us.
What glass thickness do I need for my vacuum glass project?
BENG glass comes in different thicknesses, so we always have the perfect match for your windows. This prevents distortion, warping and other hassles .
The larger the glass, the thicker the construction. Glass thickness is determined based on the area of a single pane of glass:
- 6.7 to 8.3 mm: up to 3 m²
- 10.3 mm: from 3 to 4 m²
- 12.3 mm: from 4 to 4.8 m²
- 16.3 mm: from 4.8 m²
Is BENG glass too thin for your window frames? No problem!
BENG glass is ultra-thin, but if your frames are a bit wider than 16.3 mm, we can also thicken (BENG glass Hybrid) or laminate the glass. This way it even fits perfectly into wider profiles, without having to replace your frames.
Not sure what thickness best suits your windows? No stress, we are happy to help you with a personal advice that fits your situation!
Will vacuum glass fit in my window frame?
Whether you have wooden or aluminum window frames, BENG glass's vacuum glass fits almost always. Thanks to its clever construction and ultra-thin thickness of only 6.7 mm, our glass is designed to fit into existing window frames. That means: no unnecessary renovations, no expensive new window frames and no hassle.
And the best part? You retain the authentic look of your home. Perfect for monumental buildings, homes from the 1930s or any home where character plays a role. This way you combine top insulation with style and atmosphere.
Did you know.
If necessary, we can even thicken the glass (hybrid vacuum glass) or laminate it so that it fits any profile - completely customized. Easy, isn't it?
We then place an extra cavity and/or pane against the vacuum glass package.
One of our regular partners in the field of aluminum window frames is Smits Kozijnen. Want to know more about our partnerships or curious about reliable installers in your area? Then be sure to take a look at the partner page.
What are the differences between vacuum glass (BENG glass), triple glass and HR++ glass?
Vacuum glass works in a different way than traditional insulating glass. Whereas HR++ and triple glass use air or gas between the panes of glass, with BENG glass the cavity is completely evacuated. This provides performance that simply cannot be achieved with regular insulation glass. Here are the main differences:
1. By far the best insulation value available
BENG glass offers the best insulation value worldwide. You save more heat and increase comfort in your home.
- BENG glass: U=0.35
- HR++ glass: U=1.10
- Triple glazing: U=0,70
2. Fits into existing window frames, preserving authentic appearance
BENG glass is extremely thin and almost always fits into existing window frames. HR++ and triple glass are much thicker and often require replacement of your window frames. So with BENG glass, you preserve the appearance of your building while enjoying impressive insulation performance:
- BENG glass: 6.7 mm
- HR++ glass: 21 mm
- Triple glazing: 38 mm
3. More daylight and extra clear glass (LTA).
Because BENG glass is so thin, the glass remains beautifully clear. Despite its extremely good insulation value, it lets in up to 15% more daylight than triple glazing, for example. There are variants that are extra clear or sunproof, depending on your needs.
- BENG glass: >83%.
- HR++ glass: >80%.
- Triple glazing: >65%.
4. Stable performance with horizontal installation
With BENG glass, the insulation value always remains stable even when the glass is placed at a horizontal inclination. With traditional insulation glass, the performance drops significantly.
- BENG glass: remains stable
- HR++ glass: up to -60%.
- Triple glazing: up to -40%.
5. Maximum noise reduction
BENG glass delivers strong performance at all pitches. With a laminated version or acoustic foils, the attenuation can increase even further.
- BENG glass: 36 dB (-2; -3). Laminated up to 39 dB, with acoustic foils up to 41 dB.
- HR++ glass: 31 dB (-1; -4)
- Triple glazing: 33 dB (-2; -6)
Based on the above data, HR++ usually attenuates between 30 and 37 dB and triple glass between 31 and 27 dB, with low tones in particular being less well attenuated. BENG glass remains stable around 34-33 dB and therefore performs broadly. In laminated versions or with additional acoustic foils, this BENG glass increases further.
6. Lifetime
The performance of BENG glass remains at the same level for decades, without relapse.
- BENG glass: up to 50 years stable
- HR++ glass: 20-25 years, with gradual decline in U-value
- Triple glazing: ± 30 years, with gradual decline in U-value
BENGglas Extra Clear
BENGglas Extra Clear is the clearest product in our range—almost as transparent as single glazing, yet with an impressive U‑value of 0.50. Ideal for anyone looking to maximize energy savings while enjoying extra natural daylight and free solar heat
- Top insulation (U=0.50)
- Fits in the existing frames
- Extra clear vacuum glass
- Extra light and solar heat (LTA=83, G=0.68)
- U-value tested by IFT Rosenheim (2025)
BENGglas Single Coated
BENGglas Single Coated combines the color-neutral appearance of HR++ glass with an insulation value of up to 0.40 (U). With a glass thickness of only 6.7 mm, the U-value is 0.50. Perfect for slim frames and monumental buildings.
- Maximum insulation (U=0.40 - 0.50)
- Fits into existing window frames
- Ultra slim: starting at 6.7 mm (U=0.50)
- Color neutral vacuum glass
- Natural light (LTA=78%)
- U-value tested by IFT Rosenheim (2025)
BENGglas Double Coated
BENGglas Double Coated keeps the heat inside with the high insulation value of 0.40 (U). At the same time, a smart solar control coating ensures that the sun's heat stays outside. This way, you always enjoy a cool and comfortable home — and an energy bill that remains low, even on the hottest and coldest days.
- Solar control glass (G=0.39)
- Maximum insulation (U=0.40)
- Fits in the existing frames
- U-value tested by IFT Rosenheim (2025)
BENGglas Triple Coated
BENGglas Triple Coated offers maximum sun protection and the best insulation value in the world: U=0.35! For those who want maximum energy efficiency and sun protection in commercial construction.
- The best insulation value worldwide (U=0.35)
- Highly sun-shielding glass (G=0.33)
- Fits in the existing frames
- U-value tested by IFT Rosenheim (2025)
BENGglas Hybrid
BENGglas Hybrid insulates your home much better, without replacing your existing window frames. You get the power of vacuum glass with extra edge insulation: more heat, less heat loss and no heavy, expensive triple glazing needed. Choose your own thickness and type of BENG glass, with the best insulation value available worldwide: from U=0.35.
- Maximum insulation (U=0.35 - 0.50)
- Fits existing window frames with wider profiles
- Improves the insulation value in the edges
- Can be composed entirely according to your wishes
- Including thermally broken warm-edge spacers
BENGglas Monu
BENGglas Monu combines extra clear glass with the insulation power of vacuum glass (U=0.50). Thanks to the small thickness of only 8.3 mm and the subtly wavy surface, it is the solution for monuments where the original frames must be preserved.
- Top insulation (U=0.50)
- Extra clear vacuum glass
- Extra light and solar warmth (LTA=83, G=0.68)
- Fits in the existing frames
- The best choice for monumental renovations
- U-value tested by IFT Rosenheim (2025)
BENGglas Monu Restover
BENGglas Monu Restover combines monument glass (Restover) with the insulating power of vacuum glass (U=0.50). The characteristic strong curvature in monument glass retains the authentic appearance that is so typical of historic buildings. For the first time, there is a glass solution that preserves heritage sustainably.
- Top insulation (U=0.50)
- Extra clear vacuum glass
- For extra daylight and solar warmth (LTA=83%, G=0.68)
- Laminated glass: 13.06 mm
- Monument glass: strongly wavy surface (Restover glass)
- U-value tested by IFT Rosenheim (2025)
BENGglas Sun
With BENGglas Sun, you not only save on your energy costs thanks to the extremely low U-value of 0.50 - you also generate your own energy! Thanks to the integrated solar cells, this glass is ideal for facades and roof glazing in sunny areas. Please note: only to be ordered from 50 m² in repeating sizes.
- Top insulation (U=0.50)
- Energy generation (Up to 140 Wp/m²)
- No degradation of U-value when installed horizontally
- Light in weight and slim (> 14 mm)
- U-value tested by IFT Rosenheim (2025)
- Project construction: from 50 m²
BENGglas Solar Control
BENGglas Solar Control offers the best sun protection within the BENGglas range – with an impressively low G-value of 0.29. Ideal for commercial buildings where you want to keep solar heat out and achieve maximum energy efficiency.
- Top insulation (U=0.50)
- Maximum sun protection (G=0.29)
- Fits in the existing frames
- U-value tested by TÜV Rheinland (2025)
BENGglas Pyrovac® EW 30-1
BENGglas Pyrovac® EW30-1 glass is a fire-resistant vacuum glass with a U-value of 0.40 and a total glass thickness of only 15 mm. Thanks to its EW30-1 rating, the glass provides 30 minutes of protection against fire and smoke while significantly reducing heat radiation on the non-fire side.
- Maximum insulation (U=0.40)
- 2-sided damage-resistant (EN 3569) and fall-through resistant glass (EN 2608)
- Rated for fire resistance: EW30, 1-sided fire resistant, UV stable, impact resistance class 1B1
- Glass thickness: 15 mm
- Fully customizable