What is Insulating Glass?

Insulating glass is a glass product that using support strips to separate two or more pieces of glass. The support strips fill with molecular sieve desiccant, and dry gas fills the cavity. At the same time, it’s double-sealing with butyl rubber and sealant.

It can reduce noise, heat insulation, and save energy. Generally, the cavity with inert gas can make sound insulation and energy-saving performance better. So even the temperature drops, there will be no condensation inside the glass.

An excellent insulating glass needs to have long-lasting drying ability, sealing ability, and bonding ability as a composite functional glass. So the raw material quality is essential. A typical structure is as follows:

insulating glass structure

Aluminum Spacer/Warm Edge Spacer

The thickness of the aluminum strip should be uniform, and the ventilation holes should distribute evenly. In addition, the aluminum bar must be anodic oxidation or decontamination treatment.

Warm-edge spacers are structural products made of polymer composite material UPVC and 0.1mm wall thickness 304 stainless steel to form a cavity. It fills molecular sieves and isolates the original hollow glass sheets, and plays a supporting role. Its thermal conductivity is lower than aluminum spacers, which is more energy-efficient than aluminum spacers.

Air Space

Generally, the gas to fill the insulating glass includes argon, krypton, and xenon. Argon is relatively easy to extract and has a lower price. So argon is the most common inert gas to fill the air spacer.


The internal sealing butyl sealant is the first seal of insulating glass. As a kind of hot-melt adhesive, it has a low water and air transmission rate and high viscosity. So it becomes the most effective barrier against water or air for insulating glass. The external sealing is polysulfide or silicone structural adhesive. And we can choose different outer sealing for various glass applications. Double-sealed insulating glass can be as long as 20 to 40 years.