Over vacuümglas

Vacuum glass is no ordinary insulating glass - it is a smart and future-proof solution for sustainable construction. Compared to standard insulation glass, BENG glass offers benefits that directly improve your home as well as help the climate.

• Superior insulation
  With a U-value starting at 0.35 W/m²K, BENG glass is two times better than triple glazing (0.70) and three times better than HR++ glass (1.10). This ensures less heat loss, lower heating costs and a comfortable home.
• No loss of insulation in slope
  Many insulation glasses lose up to 60% of their performance when installed at an angle. BENG glass continues to perform.
• Up to twice the lifespan
  Whereas traditional glass lasts an average of 25 years, BENG glass lasts up to 50 years. Producing it once means less CO₂ and half a century of benefit.
• Strong noise reduction
  From 36 dB to 42 dB, well above HR++ (31 dB) and triple glazing (33 dB). As a result, you live more quietly and peacefully. Ideal for homes or properties on busy roads.
• More comfort all year round
  Cool in summer, warm in winter - without draughts or cold spots.
• No condensation on the inside
  The unique edge seal completely prevents interior condensation.
• Fits into existing window frames
  With only 8.3 mm thickness, BENG glass almost always fits into existing window frames. This makes renovations easier and avoids unnecessary use of materials.
• A true climate hero
  If the entire Netherlands switches to BENG glass, we save up to 4.1 megatons of CO₂ annually - comparable to 170,000 car trips from Amsterdam to Paris.
  The production of BENG glass itself will also save 24,000 tons of CO₂ per year, thanks to production using green energy, 30% less material usage than with triple glazing, up to twice the lifespan and high insulation.
• A smart investment in the future
  A U-value that insulates up to 2x better and that for as much as 50 years. Combine that with an improved energy label and a higher home value and you have your costs back immediately!

Because you don't just buy glass, but a future-proof solution that really saves money and energy. BENG glass has an insulation value from 0.35 W/m²K - that is 2x better than triple glass (0.70) and even 3x better than HR++ glass (1.1). Less heat loss immediately means lower heating costs. It also means a better energy label and thus a higher home value. The effective payback time is often 0 years.

But that's not all. BENG glass lasts up to 50 years, while standard glass needs to be replaced after 25 years on average. Invest once, and you're set for two generations. That means less maintenance, less replacement, and thus lower overall costs.

The environment also benefits: if the entire Netherlands switches to BENG glass, we save as much as 4.1 megatons of CO₂ annually - comparable to 170,000 car trips from Amsterdam to Paris. Less CO₂ emissions and a lower energy bill: that's what we call an investment that pays for itself.

In short: with BENG glass you invest in sustainability, comfort and financial savings. Smart, right?

The price of vacuum glass varies by brand and application. Count on about 285 to 400 euros per square meter (sales advisory price excluding VAT, transportation and installation). More important, however, is what it will save you in total.

After all, with vacuum glass you save on:

• new window frames
• heavy (and expensive) hinges and locks
• your energy bill
• replacement costs (no 20-30 years, but a life span up to approximately 50 years)
• And you benefit from a better energy label.

On top of that, the value of your home increases immediately.

The recommended retail price of BENG glass is 285 euros per square meter, excluding installation, transport and VAT. The final price depends on your situation. If you order many square meters, the price per square meter may be lower. If you choose laminated or hybrid BENG glass and want a price including installation, then the investment will most likely be higher.

Want to know exactly what BENG glass will cost in your case?
Then fill out our quote form and receive 3 reliable quotes from certified BENG glass installers in your area.

Want to order for business? Then email us at info@bengproducts.nl.

Whether you have wooden or aluminum window frames, BENG glass's vacuum glass fits virtually any window. Thanks to its clever construction and ultra-thin thickness of just 8.3 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.

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 surface area of a single pane of glass:

• 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 perfectly!

The G-value (solar factor) indicates how much solar heat comes in through the glass. So: how much free heat from the sun do you actually feel inside?
Good to know: whatever G-value you choose, with BENG glass you are always assured of excellent insulation - much better than HR++ or triple glazing.
And it shows: your house loses less heat, stays warmer for longer and you don't have to heat as much. This makes a big difference to your energy bill, especially in the winter or in older homes.

What does differ is how much solar heat and daylight you let in.

• Higher G-value → more solar heat inside. Great for bright rooms or cold facades.
• Lower G-value → more solar heat blocked. Ideal for lots of glass, warm rooms or summer sun.

You choose what suits you
BENG glass comes in several variants, each with its own balance of light, heat and solar control.

Do you want extra daylight? More sun protection? Or just a little of both? You decide what's important - and whatever you choose:

• it simply fits into your existing window frames
• It is slim, light and super insulating
• it contributes to a more comfortable indoor climate

Below are the types that BENG glass offers and them G-values:

• BENGglas® Extra clear: 0.68
• BENGglas® Single Coated: 0.58
• BENGglas® Double Coated: 0.39
• BENGglas® Triple Coated: 0.33
• BENGglas® Solar Control: 0.29
• BENGglas® Monu: 0.68
• BENGglas® Monu Restover: 0.68

Looking for a different G-value? Even then we'd be happy to think with you. Please contact us to inquire about the possibilities.

If you've ever looked closely at vacuum glass, you may see them: little dots between the two sheets of glass. We call those spacers.

Spacers are tiny supports in the vacuum cavity (the space between the glass panes). They keep the glass layers from being pulled together when the air between them is removed. Without these supports, the glass could literally break due to the pressure.
In BENG glass, the spacers are:

• Placedonly every 55 mm - which is much less than other brands of vacuum glass.
• Anthracite in color, making them much less noticeable than clear or silver variants that reflect light.

Benefit for you?
A nice, calm and undisturbed view through your windows, without distracting reflections or a "grid"-like effect you sometimes see with other vacuum glass types.

Note, however, that during condensation season, you may see a sort of "dam" pattern on the glass. This means that condensation forms everywhere on the glass except around the spacers. That's because these little supports allow heat to pass through a little better, so moisture is less likely to set on the outside.
Fortunately, there are special anti-condensation coatings available that can help reduce this effect, keeping your windows looking nice longer - even in humid conditions.

Tempered vacuum glass is vacuum glass in which both sheets of glass are tempered. This means that the glass is first heated to a very high temperature and then cooled at lightning speed. This process creates a permanent, internal stress that makes the glass up to five times stronger than ordinary, untoughened glass.

Whereas untoughened vacuum glass is more fragile and susceptible to breakage, toughened vacuum glass, like BENG glass, can handle large loads, pressure differences and temperature changes effortlessly. This is why toughened vacuum glass is also called safety glass (injury-safe glass).

Why is toughened vacuum glass so much stronger?

The following happens during the toughening process:

• The glass is heated evenly to about 650 °C
• The surface is then cooled very quickly
• The outer layers tighten
• The inner core cools slowly and remains under tension

That combination creates a glass structure that:

• is 5× stronger
• Is much more resistant to impact and pressure
• tolerates temperature variations without breaking
• remains stable and retains its shape - essential for vacuum glass

This virtually eliminates thermal breakage - glass breakage due to temperature stresses - in BENG glass.

How does tempered vacuum glass break (injury safe)?

If tempered vacuum glass does break, it does not fall into sharp, dangerous shards.
The glass disintegrates into small pieces, minimizing the risk of cuts.

Why do some brands still choose untoughened vacuum glass?

Unhardened vacuum glass is easier to produce, but :

• is more susceptible to thermal breakage
• is not injury-safe
• can handle less pressure
• is less suitable for large windows

So tempered vacuum glass is a higher quality grade.

At BENG glass you always get toughened vacuum glass

Many brands still supply untoughened vacuum glass.
BENG glass never does. With us, toughened, injury-safe vacuum glass is the standard - at no extra charge.

That means:

• more safety
• more stability
• higher durability
• better performance
• fewer risks

Ventilation grilles allow fresh air into your home even when your windows and doors are closed. They help wick away moisture, ensuring a healthy indoor environment. Especially with well-insulated glass such as BENG glass's vacuum glass, good ventilation is especially important, as otherwise the house becomes too "dense" and moisture problems can occur; insulation and ventilation often go hand in hand.

The good news?

There is a ventilation grid that works perfectly with BENG glass! Duco has developed the GlasVent ZR AK (+) type, specially designed to work well with vacuum glass. So you enjoy optimal insulation and fresh air.
Want to know more? Take a look at our Duco partner page.

Only at BENGglas do you get titanium vacuum glass from LandVac - one of the many unique aspects that set BENGglas apart.
With it, you'll immediately enjoy powerful benefits:

• Titanium spacers reduce heat conduction by as much as 70%
• Titanium absortion strips extend product lifetime
• Flexible edge sealing reduces stresses by 90% and increases bending strength by 40%

If you choose titanium vacuum glass from BENGglass, you are choosing longer life, maximum strength and superior insulation!

Vacuum glass is all about innovation - and at BENGglas, we are leading the way!
With our exclusive Titanium Vacuum Glass technology, we set a new standard you won't find anywhere else.

This unique technology provides:

• 70% less heat loss thanks to titanium spacers
• Longer lifespan with titanium getters
• 90% less stress and 40% more flexural strength through flexible titanium seal
• Extra resistance to corrosion and wear, even under harsh conditions
• Lower energy consumption all year round

In short: if you choose titanium, you choose maximum lifetime, strength and insulation!

Want to know more? Check all details and advantages on our website

Laminated vacuum glass is used in places where extra safety, soundproofing or structural strength is important in addition to insulation. Think of glass at height, roof glazing or in situations where you have high noise levels.

In many cases it is even mandatory, for example if there is a risk of falling through or in roofs. The film between the layers of glass ensures that the glass does not break into sharp shards when broken - making it safer and more comfortable in everyday use.

• Facades
  As standard, BENG glass is injury-resistant on both sides: when broken, it disintegrates into small grains. In facades with height differences, laminated glass is mandatory, avoiding the risk of falling through.
  Thanks to the built-in UV filter in PVB film, furniture and floors are less likely to discolor.
• Roof glazing
  With overhead glass, safety is not a choice but a requirement. Laminated vacuum glass is the standard here: when broken, it stays together and prevents shards from falling down. Daylight comes in as normal, while the UV filter prevents discoloration of floors and furniture.
• Living past crowds? More quiet indoors?
  Noise from (air) traffic, neighbors or a schoolyard can be distracting. With acoustic laminated glass, the noise level goes down noticeably. A special interlayer in the glass absorbs some of the sound vibrations - ideal for bedrooms, work spaces or simply more peace and quiet in the living room.

In most cases, yes. Laminated BENG glass is available from as little as 13.06 mm thick, which is thinner than triple glazing. Having doubts about whether it will fit? Then we can look with you or engage an authorized dealer in your area.

With BENG glass, you can choose from three different films between the glass layers: EVA, PVB and SGP. They all ensure that the glass stays together neatly when broken, but each type has its own advantages.

• EVA (Ethylene Vinyl Acetate) is versatile, highly resistant to moisture. clear and suitable for most standard applications
• PVB (Polyvinyl butyral) is considered the industry standard in construction and within NEN standards
• PVB SoundControl This variant of standard PVB has additional soundproof properties
• SGP (SentryGlas Plus) is the ultimate option: SGP can be up to five times stronger and up to 100 times stiffer than PVB, allowing thinner glass constructions that still meet the same safety standards. SGP is also more resistant to moisture and extremely clear.

We'd be happy to help you choose which film is right for your project.

Vacuum glass was first patented in Germany in 1913. Yet it was not until 1996 that the first commercial products appeared - originating in Japan and South Korea. These early versions were still of limited use and not suitable for broader applications in construction.

The real breakthrough didn't come until 2016, when LandGlass became the first in the world to launch a fully tempered, tested and certified vacuum glass: LandVac®. Since then, the technology has continued to develop at lightning speed - resulting in a high-quality, reliable and durable titanium vacuum glass.

This was followed in 2019 by Fineo (from AGC), intended for lighter applications. But those opting for maximum performance in terms of insulation, safety and longevity will end up with LandVac.

BENGglas is the exclusive importer of LandVac in the Netherlands, Belgium and several other European countries.

Vacuum glass consists of two sheets of glass at least 4 mm thick, with a vacuum cavity of only 0.3 mm between them. Because there is no air or gas present, heat and sound transmission is virtually eliminated. An additional heat-reflective coating also blocks heat radiation.

With a total thickness of only 8.3 mm, you thus achieve an insulation performance that is two to three times better than HR++ glass - even when installed at an angle.

Depending on the brand of vacuum glass, the insulation value is usually between 0.35 and 0.70. Only with BENG glass do you benefit from the best possible value as standard: U=0.35.

The sound attenuation is also higher with vacuum glass. Whereas HR++ often stops around 31 dB, vacuum glass starts at a minimum of 30 dB. BENG glass takes this a step further and has a noise reduction from 36 dB. In laminated versions, this even rises to -42 dB. Ideal for those who want peace and quiet in their homes.

Longevity is another big advantage. HR++ lasts 20 to 25 years on average, triple glass up to about 30 years, while vacuum glass has a lifespan of up to 50 years.

What is the difference between vacuum glass and regular insulating glass?

Regular insulation glass - such as double glazing, HR++ or triple glazing - consists of two or three panes of glass with a gas-filled cavity. This acts as insulation, but remains more sensitive to heat conduction. As a result, the insulation value is lower(U=0.70-1.10) and the performance decreases as soon as the seal is damaged by weathering or corrosion, for example. The average service life is about 20 to 30 years.

In addition, standard insulation glass is much thicker (from 21 mm). As a result, window frames often need to be modified or replaced. With vacuum glass, this is usually not necessary.

Advantages of vacuum glass

• fits into existing window frames
• Insulation up to three times better than HR++ (depending on the brand)
• lifespan up to 50 years
• no drop in insulation value when inclined
• strong noise reduction
• more comfort: cool in summer, warm in winter
• no condensation on the inside

Why BENG glass is unique

• the highest insulation value in the world: U=0.35
• the best noise reduction: from 36 dB to 42 dB in laminated versions
• up to seven times fewer spacers than other brands for extra transparency
• standard safety glass (toughened) from 8.3 mm (NEN3569)
• manufactured with patented titanium technology for extra strength, insulating power and service life
• independently tested by ift Rosenheim (2024)
• provided with European test reports
• Produced on 100% green energy
• free of heavy metals

When is vacuum glass interesting?

• Renovation of existing buildings
  Due to its thin construction, it often fits directly into existing window frames, preserving the original appearance.
• New construction and energy-efficient homes
  Vacuum glass helps achieve high insulation standards and ensures a pleasant indoor climate.
• Noise reduction
  Perfect for homes in urban areas or along busy roads.
• Projects with high sustainability or comfort requirements.
  Vacuum glass saves more energy than other types of insulating glass and consists of 30% less material than triple glazing. On top of that, BENG glass is produced with green energy and delivers a substantial CO₂ reduction due to its extremely low U-value. Ideal for projects that need to be future-oriented and sustainable.

Vacuum glass varies in thickness depending on the brand you purchase. This can be as low as 6.3 millimeters for untoughened vacuum glass, but often the minimum glass thickness starts at 8.3 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 4, 5 or 6 mm thick with a vacuum space of only 0.3 mm between them. This brings the minimum glass thickness to 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 construction must be to prevent deformation or warping:

• up to 3 m²: 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 even 4,120 mm (where other vacuum glass brands can only produce up to 2,500 mm), it can happen that the pane thickness has to 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.

Vacuum glass works completely differently than traditional double glazing or HR++ glass. Because the cavity is vacuum, the glass performs much better ánd looks different up close. Below are the characteristics by which you can recognize vacuum glass - and specifically BENG glass.

1. The unique combination of glass thickness and insulation value

Vacuum glass immediately stands out because of the ratio between thickness and performance. With a glass construction from 8.3 mm - and even 6.3 mm for some unhardened versions - you can achieve an insulation value of U=0.35 to 0.70.
With regular insulation glass, this is impossible.

With BENG glass, you benefit from the highest insulation values within all vacuum glass brands: U=0.35 to 0.50, depending on the type chosen. So you preserve your window frames while enjoying the best insulation value worldwide.

2. Absorption strips

On the longest side of the vacuum glass is an absorption strip that removes moisture from the cavity during the vacuum process.
After installation, if the installation instructions have been followed, this strip disappears completely behind the glass slats.

Depending on the pane length, BENG glass has one or two absorption strips. More details can be found in our technical drawings.

3. The spacers (the small dots in the glass).

Each brand of vacuum glass has small dots in the glass: the spacers (also called microspacers or micropillars).
The distance between these dots, as well as the color, varies among manufacturers.

• BENG glass: spacers every 55 mm.
• Other brands: often 25-40 mm

With BENG glass, the spacers are always in non-reflective antractite. This prevents reflective sunlight, allowing the spacers to actually light up. All BENGglas dealers have product samples, so you can see the spacers for yourself.

4. Edge seal

A colored edge seal is a clear identifying feature of vacuum glass. You can often tell immediately by the color which brand it is.
With BENG glass, you can recognize the edge seal by:

• Nicely rounded corners - important for maintaining vacuum
• Edge height of approx. 9 mm all around
• Total visible height of approx. 13-14 mm including absorption strip
• Specific colors: white, dark red or light yellow
  (BENG glass never has green, dark yellow or other different colors).

5. Hardly any chance of thermal breakage

Because BENG glass is tempered as standard, the chance of thermal breakage is very low.
Only in exceptional cases can it still happen.

How do you recognize thermal breakage?

• The crack always starts at the edge of the glass
• Runs straight to the warmest/coolest part
• Then it bends and continues in a jagged fashion

Are you unsure if your window has a thermal break? Feel free to contact us, we'd be happy to take a look with you.

Want to be sure if you have BENG glass?
Contact us or check this page for more information. We'll be happy to help you further.

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: 8.3 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 42 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

BENG glass is unique - worldwide, in fact.

Where some vacuum glass brands stick to unhardened panes, small sizes and outdated production methods, BENG glass follows a completely different route. Our vacuum glass is toughened as standard and therefore injury safe, and is produced on a high-end 500-meter production line - developed by the pioneer in vacuum glass: LandVac.

BENG glass is the only vacuum glass in the world to use patented titanium technology, exceptional strength, large dimensions and a lifespan of up to 50 years. The result? The best insulating glass available today:

• An impressive insulation value starting at 0.35
• By far the fewest spacers on the market: per 55 mm (vs. 20-40 mm)
• Tempered and injury resistant as standard (NEN3569)
• Manufactured with titanium for extra insulation strength and durability

Below you can read step by step how our vacuum glass is made.

What is the production process of vacuum glass?

Vacuum glass consists of two glass plates of at least 4 millimeters thick with an extremely thin vacuum of only 0.3 millimeters between them. That vacuum prevents the conduction of heat as well as sound.
Making vacuum glass requires a lot of precision, high temperatures and strict quality controls.
Especially when you work with tempered vacuum glass, as with BENG glass, the process becomes more intensive and sophisticated.

Below is the full explanation.

1. Glass cutting process

The production process begins with the precise cutting of the glass sheets. Using a laser-guided machine, all panes are cut to exact dimensions - the settings are readjusted for each size.

• BENG glass is always delivered to size
• Maximum dimensions: 2,350 x 4,150 mm
• The panes are 4, 5 or 6 mm thick, depending on the total pane area

Some manufacturers vacuum a large pane first and then cut it. This is only possible with untoughened glass. BENG glass uses only tempered glass, and that requires customization from the first step.

2. Titanium edge finishing - unique in the world of vacuum glass

After cutting, the edges are primed and coated with an ultra-thin layer of titanium. This is a patented technique exclusive to BENG glass and has an immediate positive impact on the insulation, lifespan and stability of the glass.

Advantages of titanium in vacuum glass:

• Up to 70% less heat conduction
• A much longer lifespan thanks to titanium absorption technology
• 40% stronger edge connection
• 90% less tension in the glass
• High resistance to corrosion and wear

This step is the basis for the exceptional performance of BENG glass.

3. Precise glass cleaning (washing process)

Vacuum glass must be absolutely clean. In a computer-controlled washing plant, dust, dirt and micro-particles are completely removed. This is essential because any contamination within the vacuum is irreversible.

4. Glass tempering - injury-safe vacuum glass according to NEN3569

With BENG glass, each panel is tempered.
The glass panels are gradually heated to about 650°C and then rapidly cooled.

This makes the glass:

• up to 5x stronger
• resistant against large pressure differences
• dimensionally stable → the vacuum remains stable for years
• safe when broken (unsharp grains)
• suitable for temperature variations and prevents thermal breakage

Many vacuum glass brands use untoughened glass. BENG glass does not - and that makes all the difference in safety and performance.

5. Application of spacers and absorption strips.

Next, the spacers and absorption strip are applied to the tempered glass.

• The spacers distribute pressure during vacuum drawing.
• They are made of titanium
• They prevent the glass from breaking during the vacuum process

Unique to BENG glass:

• Up to 7× fewer spacers
• Only 1 spacer per 55 mm
• Other brands: 20-44 mm
• Fewer spacers = far fewer thermal bridges
• This allows us to achieve U-values as low as 0.35

The absorption strip - always on the longest side - captures residual gases during and after the vacuum process. This is essential for long-term vacuum retention. With BENG glass, it is placed in a rill so that its position is always within a height of 13-14 mm. As a result, when properly installed, it falls neatly away behind the window frame.

6. The vacuum process - complete removal of air

In a state-of-the-art vacuum chamber, the two glass sheets are brought together and the gases between the sheets are completely vacuumed out.
This process takes several hours.

This is where the extremely thin vacuum chamber (0.3 mm) is created that provides the high insulation value of vacuum glass.

7. Edge sealing with titanium - the key to a long service life

When the vacuum is at the right level, the edges are sealed with induction under vacuum.

Thanks to titanium:

• the edge connection is up to 40% stronger
• The material hardly reacts with moisture and gases
• the vacuum remains stable for years
• the window is more resistant to wear and tear and stress

The edge is the most defining component of vacuum glass - and that's exactly where BENG glass makes the biggest difference.

8. Strict quality control of each pane

Finally, each pane of glass is extensively tested in the LandVac plant for:

• vacuum retention
• glass strength
• insulation value
• density
• general stability

Only when all the values are exactly right does the pane go on transport.

Why the production process of BENG glass is so advanced

Vacuum glass seems simple at first glance - two sheets of glass, one vacuum.
But in reality, it is a process that consists of:

• a 500-meter production line
• 429 patents
• high-end tempering furnaces
• advanced automation
• titanium technology used nowhere else

With this, BENG glass sets the absolute standard for vacuum glass:
slim, injury-safe, extremely strong and with an insulation value found nowhere else.

Yes. Toughened vacuum glass is significantly safer than untoughened vacuum glass. The toughening process makes the glass up to five times stronger, able to withstand large temperature differences and better able to withstand pressure loads.
When broken, tempered vacuum glass breaks into small, blunt grains, minimizing the risk of injury. Unhardened vacuum glass, on the other hand, breaks into sharp shards and offers no injury safety.

This is why BENGglas always works with toughened vacuum glass that complies with NEN3569. This ensures maximum safety, stability and durability.