Product questions

Whether you have wooden or aluminum frames: BENGglas always fits. Thanks to the smart construction and the ultra-thin thickness of only 8.3 mm, our glass is specially designed to fit into existing frames. That means: no unnecessary renovations, no expensive new frames, and no hassle.

And the best part? You retain the authentic appearance of your home. Perfect for monumental buildings, 1930s houses, or any home where character plays a role. This way, you combine top insulation with style and ambiance.

Did you know…
If necessary, we can even thicken (hybrid vacuum glass) or laminate the glass so that it fits into any profile — completely custom-made. Easy, right?

One of our regular partners in the field of aluminum frames is Smits Kozijnen. Want to know more about our collaborations or curious about reliable installers in your area? Be sure to check out the partner page.

The U-value indicates how well glass insulates. Simply put: the lower the U-value, the better the glass retains heat in the winter – and keeps it out in the summer. This way, you save on your energy bill and increase your living comfort.
The U-value is influenced by various factors, such as:

• The coating on the glass
• The filling between the glass layers (e.g., air, gas, or vacuum)
• The cavity width – thus the space between the glass layers

How does BENGglas score compared to other types of glass?
Here is an overview of the average U-values per type of glass:

• Single glazing: 5.8 (insulation? Hardly.)
• Double glazing: 1.10
• Triple glazing: 0.70
• Other vacuum glass types: between 0.45 and 0.70
• BENGglas: from 0.35 to 0.50

In short: BENGglas has by far the best insulation value of all.
This way, you save extra on your energy bill!

*U-values measured according to the standards EN 674:2011 and ISO 19916-1:2018 by ift Rosenheim (2025).

BENGglas has an exceptionally low U-value starting from 0.35 W/m²K, which means that the glass insulates extremely well. For comparison: this is twice as good as triple glazing (approximately 0.70 W/m²K) and three times better than standard double glazing (around 1.10 W/m²K). Thanks to this excellent insulation value, BENGglas significantly saves on energy costs and helps make your home more comfortable and sustainable. Moreover, this U-value is supported by reliable European testing institutes such as ift Rosenheim and TÜV Rheinland, with recent reports from 2025 that you can consult in our knowledge base. This way, you can be sure that you are choosing quality and maximum energy savings.

BENGglas is available in various thicknesses, so we always have the perfect match for your windows. This prevents distortion, warping, and other issues.
The larger the glass, the thicker the build. The glass thickness is determined based on the surface area of a single pane:

• 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 BENGglas too thin for your frames? No problem!
BENGglas is ultra-thin, but if your frames are wider than 16.3 mm, we can also thicken (BENGglas Hybrid) or laminate the glass. This way, it fits perfectly into wider profiles without needing to replace your frames.

Not sure which thickness is best for your windows? No stress, we are happy to help you with personalized advice that fully matches your situation!

BENGglas is not only very strong in insulation but also effective in blocking sound. We measure this with the RW (C; Ctr) values — the higher the number, the quieter your home becomes.

Here are the figures at a glance:

• Double glazing has a general sound insulation of about 31 dB, with a range of 30 to 27 dB at low and high frequencies.
• Triple glazing scores slightly better with a general value of 33 dB, but at low and high frequencies, the sound level can vary from 31 to 27 dB.
• BENGglas goes a step further with a general sound insulation of 36 dB and performs very consistently at low and high tones between 34 and 33 dB.

What does that mean for you? BENGglas keeps sound out better, especially those annoying low tones that you quickly suffer from. 

This way, you not only enjoy a lower energy bill but also a much quieter and more comfortable home.

The LTA value (light admission factor) indicates how much natural daylight enters through the glass. The higher the value, the more light enters your home — and you notice that immediately. Daylight not only makes your home more pleasant to live in but also helps save energy. The more light that comes in, the less often you need to turn on the lights.

More or less light? You choose

Not every room needs the same amount of light. In a home or building with a lot of glass or direct sunlight, a lower LTA value can be beneficial. This way, you prevent bright glare, overheating, or discoloration of furniture and floors. That's why BENGglas offers different glass variants — from clear to more sun-blocking — with high and lower LTA values, depending on the function of the room and the orientation of your facades. Whatever you choose: your insulation is always top-notch, with a U-value up to 0.35.

Want to know what best suits your plans? We are happy to think along with you.

The G-value (solar heat gain coefficient) indicates how much solar heat enters through the glass. So: how much free heat from the sun do you actually feel inside?
Good to know: no matter which G-value you choose, with BENGglas you are always assured of excellent insulation – much better than HR++ or triple glazing.
And you'll notice: your house loses less heat, stays at temperature longer, and you need to heat less. Especially in winter or in older homes, this significantly reduces your energy bill.

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

• Higher G-value → more solar heat inside. Great for bright spaces 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
BENGglas is available in various versions, each with its own balance between light, heat, and sun protection.

Do you want extra daylight? Block more sun? Or a bit of both? You decide what is important — and whatever you choose:

• it fits perfectly in your existing frames
• it is slim, light, and super insulating
• it contributes to a more comfortable indoor climate

Are you unsure what works best in your situation? We are happy to think along with you.

If you have ever looked closely at vacuum glass, you might see them: small dots between the two glass panes. We call them spacers.

Spacers are tiny supports in the vacuum cavity (the space between the glass panes). They ensure that the glass layers are not drawn towards each other when the air between them is removed. Without these supports, the glass could literally break due to the pressure.
At BENGglas, the spacers are:

• Placed only 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-colored variants that reflect light.

Advantage for you?
A beautiful, calm, and unobstructed view through your windows, without disturbing reflections or a 'grid'-like effect that you sometimes see with other types of vacuum glass.

Note: during the condensation season, you may notice a kind of 'dam' pattern on the glass. This means that condensation forms everywhere on the pane, except around the spacers. This is because these small supports conduct heat slightly better, causing moisture on the outside to set less quickly.
Fortunately, there are special anti-condensation coatings available that can help reduce this effect, so your windows continue to look beautiful for longer — even in humid conditions.

Safety glass means that when the glass breaks, it does not shatter into large, sharp pieces, but into small, blunt granules. This significantly reduces the risk of injuries — extra nice for the safety in your home or building.

• Tempered glass (safety glass): breaks into small, round granules that are not sharp.
• Untempered glass: breaks into large, sharp shards that can be dangerous.

At BENGglas, we consider safety very important. That is why our entire range is standard tempered and therefore safety glass.

Tempered glass is five times stronger than regular, untempered glass. How is that possible? The glass is first heated to a high temperature and then rapidly cooled. This process makes it much more resistant to impact and large temperature differences (thermal breakage is completely eliminated).

And if the glass does break, it shatters into small, blunt pieces (injury-safe) instead of dangerous sharp shards. Extra safe, especially if you have children or pets.

With many brands of vacuum glass, tempered glass is not (always) possible. But with BENGglas, it is! This way, you always get strong and safe glass from us, even if you choose a thin variant.

Only at BENGglas do you get titanium vacuum glass from LandVac — one of the many unique aspects that sets BENGglas apart.
This allows you to immediately benefit from powerful advantages:

• Titanium spacers reduce heat conduction by as much as 70%
• Titanium absorption strips extend the product's lifespan
• Flexible edge sealing reduces stress by 90% and increases bending strength by 40%

If you choose titanium vacuum glass from BENGglas, you choose a longer lifespan, maximum strength, and superior insulation!

BENGglas not only lasts longer than traditional insulating glass, it also continues to perform as if it were just installed. While the U-value (insulation value) of standard insulating glass decreases after a few years, it remains stable with BENGglas – for years.

How do we know that? In the lab, the conditions of 25 years of use are simulated. Afterwards, the U-value was found to be exactly the same. That’s why we confidently guarantee a lifespan of 25 years. The expected lifespan? No less than 50 years.

And with a warranty of up to 20 years, you are well above the standard with BENGglas — that is 10 years more than what is common in the glass industry.

The smallest standard size of BENGglas is 200 × 230 mm. Smaller is sometimes possible, as long as the diagonal is at least 300 mm.
The largest size? 2,350 × 4,150 mm – unique in the world of vacuum glass and another good example of why BENGglas stands out.

No. BENGglas has been extensively tested for the presence of heavy metals such as lead, cadmium, mercury, and chromium-6, as well as for harmful substances such as PBBs (polybrominated biphenyls) and PBDEs (polybrominated diphenyl ethers).
The RoHS tests show that BENGglas does not contain these substances – which is certainly beneficial for both people and the environment!

The delivery time is approximately 12 to 14 working weeks.
If you choose BENGglas Monu Restover, please allow for an additional 3 weeks.

In vacuum glass, everything revolves around innovation – and at BENGglas, we are leading the way!
With our exclusive Titanium Vacuum Glass technology, we set a new standard that 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 bending strength due to flexible titanium sealing
• Extra resistance to corrosion and wear, even under harsh conditions
• Lower energy consumption, all year round

In short: when you choose titanium, you choose maximum lifespan, strength, and insulation!

Want to know more? Check out all the details and benefits on our website

Laminated BENGglas offers enormous possibilities: you can choose from three types of films (EVA, PVB, or SentryGlas Plus) and an almost unlimited range of counterpanes.

All types of films ensure that no shards come loose in case of breakage. But it doesn't stop there – you benefit from many more smart advantages. Each type of film has unique properties, giving the pane – in addition to the superior insulation value of BENGglas – many extras, such as:

• fall-through safety – safe at height, for all building functions
• burglary resistance – not easy to get through
• extra sound insulation – from -36 dB to -39 dB or even more, noticeably quieter
• better UV protection – your furniture stays beautiful longer
• colors and patterned glass types – your pane completely changes appearance

You can completely decide how to compose your layered pane. Think of patterned glass for a unique appearance, or extra films for maximum safety. Let us know what you are looking for – we are happy to think along with you.

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

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

• Facades
  Standard BENG glass is double-sided injury-safe: it breaks into small granules. In facades with height differences, layered glass is mandatory to avoid the risk of falling through.
  Thanks to the built-in UV filter in the PVB film, furniture and floors discolor less quickly.
• Roof glazing
  When glass is above your head, safety is not a choice but a requirement. Layered vacuum glass is the standard here: upon breakage, it stays together and prevents shards from falling down. Daylight still comes in, while the UV filter prevents discoloration of floors and furniture.
• Living near noise? More peace inside?
  Sounds from (air) traffic, neighbors, or a schoolyard can be disturbing. With acoustically layered glass, the noise level noticeably decreases. A special interlayer in the glass absorbs part of the sound vibrations – ideal for bedrooms, workspaces, or simply more peace in the living room.

In most cases, yes. Laminated BENGglas is available from just 13.06 mm thick, which is thinner than triple glazing. Not sure if it will fit? We can help you, or put you in touch with a certified installer in your area.

At BENGglas, you can choose from three different films between the glass layers: EVA, PVB, and SGP. They all ensure that the glass stays neatly together in the event of breakage, but each type has its own advantages.

• EVA (Ethylene Vinyl Acetate) is versatile in application, highly resistant to moisture, clear, and suitable for most standard applications.
• PVB (Polyvinyl Butyral) is considered the industry standard in construction and within the NEN standards.
• PVB SoundControl this variant of standard PVB has additional soundproofing 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 for thinner glass constructions that still meet the same safety standards. SGP is also more resistant to moisture and extremely clear.

We are happy to help you choose which film suits your project.