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What types of insulating glass are there?


Insulating glass has been in further development since 1948. From the old (Thermopane) double glazing to the vacuum glass of today.
We therefore briefly explain all types, the benefits and the reasons why investing in insulating glass is so essential.


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Type of insulating glass

Insulating glass is divided into three categories:

  • Double glazing: standard double glazing (Thermopane)
  • High-efficiency insulating glass: HR, HR+, HR++ and HR+++ (Triple) glass
  • Vacuum glass ( BENGglas )
Schott glas_Restover_Pulled monumental glass

Insulating glass options

Additional functions can be assigned to insulating glass by applying additional after-effects such as coatings, foils, extra windows or by applying unique product techniques.

This includes burglar-resistant, fall-proof, fire-resistant, sound-insulating, monumental and sun-resistant glass. Such post-processing is also possible with BENGglas .

Standard double glazing
HR glass
HR++ glass
Triple glass
Insulation value
Air + coating
Gas + coating
Gas + coating

Insulating glass 1: standard double glazing

Double glazing became the first step after single glazing and is also one of the most common types of insulating glass in older buildings built after the Second World War. Popularly, the old double glazing is also called Thermopane, named after the brand that was the first to market the type of insulating glass.

Construction and superstructure

The glass consists of two panes of approximately 4 to 5 mm thick with a cavity filled with air in between. Air conducts heat better than a gas filling or a vacuum, which means that the insulation value is less good than with other types of insulating glass.

HR++_HR+++ double glazing HR

Insulating glass 2: high-efficiency insulating glass

HR (high-efficiency insulation) glass became the next step in insulating glass after standard double glazing. By replacing an air filling with a gas filling, the conduction from inside to outside was reduced. This resulted in an immediate improvement in the insulation value.

By applying heat coatings to the window, another step in insulation performance was achieved (HR+, HR++). These reflect the heat back into the home. By expanding the entire package with a third pane, the insulation performance was improved again (HR+++).

In essence, the more pluses, the better the insulation of the window.

Advantages and disadvantages of high-efficiency insulating glass

HR glass insulates considerably better than standard double glazing, but quickly becomes very thick and heavy. This leads to intensive labor and extra costs in materials (new window frames and new/heavier hinges and locks).

Even though noble gas insulates better than air, conduction still takes place, so the insulation value does not measure up to vacuum glass . Small cracks can develop in the frame that holds the two panes together, causing HR glass to lose its insulation value over time. not the case with vacuum glass The lifespan of HR glass is also shorter than vacuum glass (20-40 years versus 25-50 years).

Insulating glass 3: BENGglas vacuum glass

BENGglas is the latest step in the development of insulating glass. By not using air or gas between the two panes, but instead creating a vacuum, conduction is kept to a minimum. This allows much better heat insulation, but also much better sound insulation, to be achieved with less material. This results in comfortable and quiet living.

Curious about all the benefits and what vacuum glass can do for you? Then request a quote immediately from one of the BENGglas dealers .

External characteristics of vacuum insulating glass

Vacuum glass is easy to recognize because of the tiny spacers that are incorporated into the glass.
Spacers and absorption strips are therefore inherent to vacuum glass. We will briefly take you through the most important external features so that you always know what you are choosing.

BENGglas _vacuum insulating glass

Spacers & Vacuum Caps


Spacers are small dots found between the two panes of glass. These are intended to distribute the pressure on the glass during the vacuum process. Without spacers the glass would break. Our dealers are always in possession of a product sample. This way you can always view the spacers before purchasing.

Vacuum caps

Vacuum caps were used to extract the air between the two panes. However, technology is continuously developing. This now makes it possible to also extract air from the edges. This means that vacuum caps are no longer necessary.


Absorption of moisture

Absorption strips or points

Absorption strips or points are intended to remove moisture from between the glass for a long time. This way the vacuum is kept intact. Depending on the production process, you will be dealing with an absorption point or absorption strip. With BENGglas + it will always protrude above the window slat. With BENGglas MAX and BENGglas BASIC this could be nicely concealed, provided there is the necessary space for it. The BENGglas dealers will be happy to advise you further on this.

Insulating glass types

Insulating glass: pros and cons at a glance

To make an old home or building with old double glazing more sustainable, the choice quickly falls on HR++, Triple or vacuum glazing. However, by choosing vacuum glass you immediately save on new window frames and new (heavier) hinges and locks. You immediately start with long-term savings in your energy bill of 25 to even 50 years. Where the insulation value of high-efficiency glass increases slowly due to leakage and has a shorter lifespan of between 20 and 40 years.

Price of insulating glass

vacuum glass is more expensive to purchase than HR glass, but the value of the glass goes directly into improving your energy label and saving materials.
That is why it is not smart to only look at the base price, but to take into account potential increases in value and savings.

Therefore, always request a no-obligation cost comparison from one of the BENGglas dealers to make a well-considered choice.


More information?

Do you have a question? We are happy to help you. Send us a message via the contact form and we will get back to you within 24 hours.

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Reference projects type BENGglas