The difference between insulating glass and ordinary double glazing

2019 03/26

The insulating glass is a glass deep-processed product in which two or more pieces of flat glass are separated by a partition frame and sealed with a sealant to form a dry gas space between the glass layers. It should be noted that the edge of the insulating glass is tightly sealed with a sealant. The inner cavity of the insulating glass is filled with dry air or an inert gas. The part of the gas is sealed in the cavity for a long time and cannot convect with the outside air. Therefore, The heat on both sides of the insulating glass does not carry away heat due to the convection of the gas between the glass. On the other hand, air is a poor conductor of heat, and the two layers of glass separated by a sealing gas have little heat conduction with each other, thereby providing good heat insulation. In addition, when a large temperature difference occurs on both sides of the insulating glass, since one glass only feels the temperature on one side, the two surfaces of the single glass do not have a large temperature difference. Therefore, when the temperature difference between the inside and the outside of the insulating glass is not particularly large (≥100 ° C), no frosting or dew condensation occurs. In addition, it should be noted that the insulating glass is not vacuum glass, and the pressure of the gas in the hollow glass cavity is basically the same as the outside, otherwise the glass is easily broken.

From the above explanation, it can be known that the insulating glass and the ordinary double glazing are substantially different. The most essential difference between the two is that the former is sealed and the latter is not sealed. It is precisely because of the unsealing of the double-layer glass that dust and water vapor easily enter the glass cavity, the water vapor is cold and frosted, and the condensation on the inner surface of the glass can never be removed by heat condensation. The glass is blurred and filthy. Of course, double-layer glass can also play a certain role in sound insulation and heat insulation to a certain extent, but the performance is far from the hollow glass.

The hollow glass construction generally refers to a sealed structure of an insulating glass. There are two main sealing structures for insulating glass: single-channel sealing and double-channel sealing. The single-pass sealing structure means that only one glue is used for the hollow glass structure, and silicone rubber, polysulfide rubber, polyurethane, hot melt butyl rubber or comfort rubber strip can be selected. The double-pass seal structure refers to the two-layer glue of the hollow glass structure, usually using polyisobutylene glue as the first seal and a structural glue such as polysulfide or silicone glue as the second seal. In general, in the double-pass sealing system, the glue used for the first seal has high water vapor transmission rate but poor structural properties, while the second sealant has high structural performance and poor water vapor transmission resistance.

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