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The three products of insulating glass, double glass and vacuum glass are actually completely different products. Their functions and production processes are very different. The author will introduce these three types of glass in detail below:

Double glass, means replacing the single piece of glass on traditional doors and windows with two pieces of glass. The air layer is not sealed with an effective sealing material, which results in a large amount of dust and moisture easily entering between the two pieces of glass. Therefore, double-layer glass is a product that is restricted to construction. 

The double glass 1

The double glass 1

Vacuum glass, as the name implies, is that the space layer between two pieces of glass is in a vacuum state, which greatly reduces the thermal conductivity of the glass product; however, because the production process of vacuum glass is very complicated, mass industrial production cannot be achieved, and the price is high, So it is rarely used in ordinary houses. 

The vacuum glass 1

The vacuum glass 1

Insulating glass is to separate two pieces of glass by an effective sealing material and a spacer material, and a desiccant that absorbs moisture is installed between the two pieces of glass to ensure that the inside of the hollow glass is a dry air layer for a long time. There is no moisture and dust; at the same time, hollow glass is easy to be mass-produced industrially, so hollow glass is a large number of recommended products in new buildings

The insulating glass 1

The insulating glass 1

The Difference between Laminated Glass and Insulating Glass

1. Laminated glass is to sandwich a layer of PVB interlayer film between two pieces of glass. Even if the glass is broken, the shards will be stuck on the film, and the surface of the broken glass remains clean and smooth. This effectively prevents the occurrence of debris piercing and penetrating falls, and ensures personal safety. 

2. There is a certain cavity between the glass and the glass of the hollow glass. Therefore, it has good heat preservation, heat insulation, and sound insulation properties. If various light-diffusing materials or dielectrics are filled between the glass, better effects of sound control, light control, and heat insulation can be obtained. The difference between hollow glass and ordinary double glass Insulating glass is a deep-processed product of glass that consists of two or more pieces of flat glass, separated by a spacer frame and sealed with a sealant so that a dry gas space is formed between the glass layers. It should be reminded that the edge of the hollow glass is strictly sealed with sealant. The inner cavity of the hollow glass is filled with dry air or inert gas. This part of the gas is sealed in the cavity for a long time and cannot be convective with the outside air. Therefore, The heat on both sides of the hollow glass will not take away heat due to the convection of the gas between the glass.

The Difference between Insulating Glass and Ordinary Double Glass

Insulating glass is a deep-processed product of glass that consists of two or more pieces of flat glass, separated by a spacer frame and sealed with a sealant, so that a dry gas space is formed between the glass layers. It should be reminded that the edge of the hollow glass is strictly sealed with sealant. The inner cavity of the hollow glass is filled with dry air or inert gas. This part of the gas is sealed in the cavity for a long time and cannot be convective with the outside air. Therefore, The heat on both sides of the hollow glass will not take away heat due to the convection of the gas between the glass.

The processing of argon gas filing with insulating glass 1

The processing of argon gas filing with insulating glass 1


The insulating glass filled with inert argon gas 1

The insulating glass filled with inert argon gas 1

On the other hand, air is a poor conductor of heat, and the two layers of glass separated by a sealing gas conduct little heat to each other, thus playing a good thermal insulation effect. In addition, when there is a large temperature difference between the two sides of the hollow glass, since a piece of glass only feels the temperature on one side, there will not be a large temperature difference between the two surfaces of the single piece of glass. Therefore, when the temperature difference between the inside and outside of the insulating glass is not particularly large (≥100°C), frosting and condensation will not occur. In addition, it should be noted that the hollow glass is not vacuum glass, and the pressure of the gas in the inner cavity of the hollow glass is basically the same as that of the outside, otherwise it is very easy to cause the glass to break.

The keeping-warm function of insulating glass 1

The keeping-warm function of insulating glass 1

Through the above explanation, we can know that hollow glass and ordinary double-layer glass are essentially different. The most essential difference between the two is that the former is sealed and the latter is not. It is precisely because of the unsealed double glass that dust and water vapor can easily enter the inner cavity of the glass. The water vapor will frost when it is cold, or dew when it is heated. The dust attached to the inner surface of the glass can never be removed. It will make the window soon after installation and use. The glass was blurred and filthy. Of course, double-layer glass can also play a role in sound insulation and heat insulation to a certain extent, but its performance is far from that of insulating glass.

The Difference between Insulating Glass and Double Glass

Insulating glass is a combination of two or more pieces of glass. The space between the glass and the glass is isolated from the outside by a sealant, and the inside is air or other special gases. Insulating glass has excellent thermal and sound insulation properties and is much lighter than brick walls or concrete walls. For the requirements of building energy-saving, insulating glass is widely used for its irreplaceable superior performance. The common performance characteristics of double-layer glass and hollow glass: good heat insulation, sound insulation, heat preservation, anti-condensation, reduction of cold radiation and safety performance, energy-saving, etc. are the first choice for energy-saving glass.


Insulating glass has the functions of heat preservation, energy-saving, sound insulation, and anti-frost. Even if the outdoor temperature is below -30℃, while the indoor temperature reaches 18℃, and the relative humidity reaches above 85%, there will be no frost in the interlayer which will affect the sight and lighting.There is an essential difference between ordinary double-layer glass and insulating glass. The biggest difference is that the periphery of ordinary double-layer glass is not sealed, which will cause the air in the interlayer to have a certain humidity and convection with the outside air (indoor and outdoor). Convection between indoor and outdoor air and the air in the glass interlayer will cause condensation and frost, which will affect the line of sight and lighting. When the temperature rises and the frost on the inner surface of the glass turn into water, water will accumulate in the lower part of the interlayer. 

Second, the suspended particles and dust in the air are inevitably brought into the interlayer and adhered to the inner surface of the glass during the convection inside and outside the interlayer, which will contaminate the inner surface of the glass interlayer over time and make cleaning difficult.

Sound insulation effect of insulating glass 1

Sound insulation effect of insulating glass 1


Ordinary double glazing has two advantages: 

The first advantage is that double glazing is cheaper than insulating glass; the other advantage is that under the same specifications and conditions, the thermal conductivity of ordinary double glazing is slightly lower than that of insulating glass, which is beneficial to heat insulation.


For more information about Jinan LIJIANG Glass insulating glass processing equipment and insulating glass processing accessories, please click here to learn more. 

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