I want the best insulating glass

Insulating glass is the smart successor to single-pane glass. It consists of two or three layers of glass, with air or gas in between - as in HR++ glass or HR+++ glass. It often also has a special heat-resistant coating on it (low-e) for additional insulating properties.

The latest innovation? Vacuum glass!
And BENG glass is leading the way in this. With an exclusive LandVac range, already in use internationally since 2016, the product has amply proven its added value.

What makes the difference?
Instead of gas, BENGglas uses an ultra-thin vacuum layer between two sheets of glass. This virtually eliminates heat loss through conduction and convection. Add a high-performance low-e coating, and heat radiation has no chance either.
It sounds simple, but there is serious technology behind it. Each sheet of glass contains some 429 patents - and that is reflected in its performance.

BENG glass achieves a U-value of just 0.35. By comparison, HR++ glass stays at 1.1 and HR++ glass at 0.70. Even though BENG glass is thin and light enough to simply fit into existing window frames.

Anyone looking into insulating glass will soon come across different types of glass. Each type has its own structure, insulation value and lifespan. Below is a clear overview of the most common types of insulating glass and how they differ from one another.

• Single-pane glass - U-value: 5.8
  This glass offers virtually no insulation and is no longer permitted in new buildings. Single-pane glass is only found in older buildings.
• Double glazing / Thermopane - U-value: 2.8
  An older type of insulating glass with two panes of glass and air between them. No insulating coating is present, so performance is limited.
• High performance glass - U-value : 1.9
  Equipped with a heat-resistant coating, but the cavity is still filled with air. As a result, insulation remains limited.
• HR+ glass - U-value: 1.6
  An improved version with a stronger coating, but without noble gas filling.
• HR++ glass - U-value: 1,1
  Currently the most widely used insulation glass in the Netherlands. It has an insulating coating as well as a noble gas filling such as argon or krypton.
• HR++ / Triple glass - U-value: 0,7
  Consists of three layers of glass with multiple coatings and gas fillings. Insulates well, but is heavy, thick (± 40 mm) and therefore often does not fit into existing window frames.
• Vacuum glass / BENG glass - U-value: 0.35 - 0.50
  The latest generation of insulation glass. This glass consists of two thin tempered glass plates with a vacuum of 0.3 mm between them. As a result, virtually no heat or sound is lost. BENG glass insulates up to three times better than HR++ and twice as well as triple glazing, while fitting into existing window frames and lasting up to twice as long.

When it comes to the best insulating form of insulating glass, vacuum glass - and specifically BENG glass - is the absolute leader right now. Whereas traditional types of glass such as HR++ and triple insulation glass still work with a gas-filled cavity, vacuum glass uses a complete vacuum between the glass panes. This makes it almost impossible for heat to escape.

Comparison of insulation values

• HR++ glass: U-value ± 1.1
• Triple glazing: U-value ± 0.7
• Vacuum glass / BENG glass: U-value 0.35 - 0.50

The lower the U-value, the better the insulation. With a U-value starting at 0.35, BENG glass performs up to 3 times better than HR++ and 2 times better than triple glazing - while being much thinner and lighter.

Why BENG glass is the best insulating insulation glass:

• The ultra-thin vacuum cavity prevents heat loss through conduction and convection
• The heat-reflective coating blocks heat radiation
• The glass maintains stable performance even in horizontal inclination
• It fits into existing window frames without modification
• Service life is up to 2× longer than standard insulating glass

Conclusion
The best insulating insulation glass today is vacuum glass, with BENG glass being among the top worldwide. You benefit from the highest insulation value, longevity and maximum comfort - in virtually any home or building.

What are the benefits of insulating glass - and why is BENG glass the better choice?

Insulating glass retains heat better than single-pane glass. The double layer of glass with gas-filled cavity reduces heat loss, increases home comfort and lowers your energy costs. That's why insulating glass has been the standard in homes and offices for years.

But BENG glass goes much further than traditional insulating glass. Thanks to vacuum technology, it performs at a level that HR++ and HR++ cannot match.

• Exceptionally low U-value from 0.35
  Much better than HR++ (U=1.10) and HR+++ (U=0.70). Heat loss through the cavity is almost impossible.
• Strong sound insulation
  Up to 36 dB noise reduction, higher than standard insulation glass.
• Slim, light and fits into existing frames.
  Ideal for renovation without demolition.
• Up to 50 years of service life
  About twice as long as HR++ or HR+++.
• Sustainable choice
  Less heat loss means less energy consumption and less CO₂ emissions.

So BENG glass offers all the benefits of insulation glass, but with a much higher insulation value, longer life and more comfort - a future-proof upgrade for any home or building.

Building smarter starts with revolutionary insulating glass. Whether for renovation, new construction or commercial construction, BENG glass makes the difference. Thanks to the ultra-thin vacuum technology, an impressively low U-value of 0.35 and the light, slim profile, BENG glass is widely applicable:

• Monumental renovations
  BENG glass is so thin and light that it fits effortlessly into existing window frames - where HR++ or HR++ glass is often too thick or heavy. This allows you to retain the authentic look so characteristic of monumental buildings.
  
  With BENGglas Monu or BENGglas Monu Restover, you also choose a special monument version, which even retains the characteristic undulations of old glass. This preserves the authentic appearance of the historic glass, but gives the building the insulation value of the future. Never before have historic buildings been so energy efficient.
  

• New building projects
  Glass takes up a large part of the building envelope - that's where you can gain the most in terms of insulation. With BENG glass, you can save up to three times more energy than with HR++ glass and meet the mandatory BENG standard faster, without the need for heavy heat pumps or other costly additional measures.

  The glass is lightweight, saving you construction costs and making it suitable for slim profiles and special facade details. In addition, BENG glass lasts up to twice as long as HR++ glass and provides additional noise reduction of up to -39 dB (or more).

  On top of that, you opt for significantly lower CO₂ emissions and are immediately prepared for the stricter standards of the future.
  

• Non-residential buildings and offices
  Buildings with a lot of glass often consume extra energy - especially in non-residential construction. BENG glass directly reduces that energy demand, thanks to its extremely low U-value starting at 0.35. That means lower energy costs and a comfortable indoor climate all year round.
  Do you opt for extra solar control coatings or noise reduction up to 39 dB? Then you create not only an energy-efficient, but also a quiet and pleasant workplace.
  
• Future-proof or energy-positive construction
  With an expected service life of 50 years, low environmental impact and the best insulation value on the market, BENG glass is the choice for sustainable construction. Substantially fewer emissions, less replacement and years of lower energy costs.

The strength of insulating glass begins with its U-value. This number indicates how much heat is lost per second per square meter of glass surface. The lower the U-value, the better the glass insulates - and the more energy (AND cost) you save.

The U-value is determined by three things:

• the number of layers of glass
• the filling between the glass layers (air, gas or vacuum)
• and the quality of the heat-resistant coating (low-e).

Below is an overview of the most common types of glass and their performance:

• Single-pane glass - U-value: 5.8
  Offers hardly any insulation. No longer permitted in new construction.
• Double glazing / Thermopane - U-value: 2.8
  Obsolete technology. Only air filling, no coating.
• HR glass - U-value: 1.9
  Equipped with an insulating coating, but still filled with air.
• HR+ glass - U-value: 1.6
  Improved coating, but still without gas filling.
• HR++ glass - U-value: 1,1
  Standard in many homes. Has a coating as well as a noble gas filling such as argon or krypton.
• HR++ / Triple glass - U-value: 0,7
  Consists of three layers of glass with multiple coatings and gas fillings. Insulates well, but is heavy and thick (± 40 mm).
• Vacuum glass / BENG glass - U-value: 0.35 - 0.50
  The latest generation of insulating glass. Two thin sheets of glass with a vacuum between them. Insulates three times better than HR++ and twice as well as triple glazing - while fitting into existing window frames and lasting twice as long.
  

Conclusion:
The lower the U-value, the better the glass performs.

With BENG glass you choose maximum insulation, while it simply fits into your existing window frames.
That means:

• lower carbon emissions.
• less use of materials
• lower energy costs
• no expensive window frame replacement required

The U-value of insulation glass is important, but ultimately what counts is the total frame system (Uw-waarde). The material of the frame (wood, plastic or aluminum) and its thermal properties affect the final insulation value.
Below you can see what to expect from BENG glass in different types of window frames:

Wooden or plastic frames

• BENG glass Extra Clear: Uw value of 1.2 W/m²K
• BENG glass Single, Double or Triple Coated: Uw-value of 1.1 W/m²K

Aluminum window frames (thermally broken)

• BENGglas Extra Clear: Uw-waarde of 1.6 W/m²K
• BENG glass Single, Double or Triple Coated: Uw-value of 1.5 W/m²K

Aluminum frames (not thermally broken)

• BENGglas Extra Clear: Uw-waarde of 2.7 W/m²K
• BENG glass Single, Double or Triple Coated: Uw value of 2.6 W/m²K.

Tip: with aluminum, always choose a thermally broken profile for the best insulation. This way you get the maximum return from your BENG glass.

Please note, the above Uw-waardes are all based on fixed values. In practice, these values can be considerably lower. Always check with your frame supplier about this.

Whereas the insulating effect of traditional insulating glass (such as in high-efficiency double-glazing / triple-glazing) can slowly diminish due to damage to the seals, allowing moisture and air to penetrate, this is not the case with vacuum glass.

The edges of BENG glass are fused and sealed with a patented titanium edge seal. This allows you to benefit from twice the lifespan of vacuum glass, up to 50 years. Traditional insulation glass has a maximum lifespan of up to 30 years.

Our patented titanium technology:

Because the edges of BENG glass are fused, with BENG glass you avoid corrosion and cracking even under the harshest conditions. The use of titanium is patented and offers not only longer life but also maximum insulation performance:

• 70% less heat conduction due to titanium spacers
• Longer service life thanks to titanium absorption strip
• 90% less stress, 40% stronger thanks to flexible titanium edge seal
• Extra resistance to corrosion and wear, even under the harshest conditions

You choose titanium. Then you choose maximum lifetime and insulation strength!

The tilt angle of insulation glass can have a major impact on its insulation value (U-value). With traditional insulation glass, performance deteriorates significantly once the glass is sloped - in some cases up to 60% loss.

With vacuum glass, this does not happen.
BENG glass retains its insulation value completely regardless of the slope angle. Whether you apply the glass vertically, at an angle or even horizontally: the U-value remains the same.

The data below shows how much traditional glass deteriorates at different slope angles, while BENG glass remains stable (Source: Glass in Picture, Dec 2024):

Inclination angle: U-value Double glass (6-12-6) / triple glass (4-15-4-15-4) - BENG glass (4-0.3-4):

• 90 degrees (vertical): 1.1 / 0.7 / >0.35
• 60 degrees: 1.4 / 0.8 / >0.35
• 45 degrees: 1.5 / 0.9 / >0.35
• 10 degrees: 1.6 / 0.9 / >0.35
• 0 degrees (horizontal): 1.6 / 1.0 / >0.35

In short, the drop for triple-glazing is just over 40% and as much as 60% for double-glazing. With BENG glass, the insulation value always remains the same regardless of the angle of inclination!

Spacers in vacuum glass

In vacuum glass, such as BENG glass, the glass sheets are under high pressure during the vacuum process. Without support, they would be pressed together and break. This is why there are always small spacers in vacuum glass, in all brands. These dots are spread across the glass surface and ensure that the pressure is evenly distributed.

Spacers in insulation glass

In insulation glass, the cavity is much wider (12-20 mm) and there is no vacuum pressure. Therefore, there are no dots in the glass field, but a continuous spacer along the edge of the glass package.

Main differences

• Vacuum glass has spacers in the glass surface, insulation glass only in the edge
• The dots in vacuum glass are microscopic, making the glass package much thinner (from 8.3 mm)
• In vacuum glass, the spacers are needed to absorb high pressure; in insulating glass they are not

Why BENG glass excels at this

• Up to seven times fewer spacers than other vacuum glass brands
• Fewer spacers means better insulation because each spacer forms a small cold bridge
• Non-reflective anthracite spacers that are hardly noticeable even in bright sunlight (barely visible from 2-3 meters), unlike transparent dots that actually reflect light back

Do you live in Flanders? Then there is good news! When renovating your home or building, you can take advantage of the renovation premium. Do you replace your old glass with BENG glass? Then you get as much as €16 per m² back!

Subsidy application? Super easy:

1. Have BENG glass installed by an authorized dealer or contractor.
2. Apply for the premium via the online counter at Vlaanderen.be.
3. After installation, you get a certificate from the contractor, which you use with your application.

Saving money can be that simple!

The subsidy for standard insulation glass?
This is also at €16 per square meter for high-efficiency glazing (HR++).

• Maximum subsidy: The premium is capped at a maximum of €600 per home.
• Maximum area: The subsidy is granted for a maximum of 20 m² of glass.

Thanks to the Sustainable Energy and Energy Saving Investment Subsidy (ISDE), you can get an attractive allowance when you make your home more sustainable with insulating glass.

Subsidy for BENG glass (NL)

The following amounts apply for BENG glass:

• € 25 per m² when you only replace the glass (report code: KA18780)
• € 111 per m² when you also install new window frames (report code: other).
• € 46 per m² when you live in a national monument and replace the glass.

Do you also take another insulation measure, such as roof, wall or floor insulation? Then the subsidy is doubled.

Not sure if your home is a national monument? You can easily check via RVO.nl.

For entrepreneurs
Would you like to make your business premises more sustainable? Then you can use the Energy Investment Allowance (EIA). This allows you to get up to € 300 per square meter in tax benefits. The minimum investment is € 2,500. Do not forget to submit the application within three months after installation via the eLoket of RVO.nl.

Subsidy for traditional insulation glass as of January 1, 2025.
There are also allowances for regular insulation glass:

• HR++ glass: € 25 per m² (for one insulation measure)
• Triple glazing: € 111 per m² (for one insulating measure, only if you also replace your window frames)

Important rules (ISDE.nl):

• Minimum surface area: For the subsidy, you must install at least 3 m² of insulation.
• ISDE scheme: You can apply for this subsidy via the Rijksdienst voor Ondernemend Nederland (RVO).
• Second measure: If you have a second insulating measure carried out in addition to glass insulation (such as cavity wall, facade or roof insulation), the subsidy amount per square meter is increased.
• Local subsidies: In addition to the national ISDE subsidy, local subsidies may also be available through your municipality or province.

At BENG glass, we look further ahead. Because our insulation glass has an expected lifespan of about 50 years, we give you up to a 20-year warranty - that's more than twice as long as HR++ or HR+++ insulation glass.

What is covered by the warranty?

• 20-year warranty on the basic range, without additional layers or hybrid applications
• 10-year guarantee on laminated versions
• 5-year warranty on fire-resistant versions
• 5-year warranty on BENG glass Monu Restover

The warranty means that we redeliver your BENG glass free of charge if it loses its insulating performance within the warranty period. So you are assured of good performance for years to come.

Want to know more?
You can find all the details in our warranty conditions under ''documentation''.