Specifications and Functions of Insulated Glass Units
Release date:
2025-09-01
Currently, most doors and windows on the market are equipped with double-glazed insulated glass, and the specifications of the insulated glass used can vary significantly depending on the model. So, do consumers really need to have an in-depth understanding of insulated glass? The key thing to convey to consumers is that they only need to know the thickness of the glass and the type of material it’s made from.
On the market, you’ll find two main types of glass: patterned glass and float glass—though float glass is generally considered superior. Glass thickness typically ranges from 4mm to 5mm. Currently, these two types are the most commonly used for insulated glass in doors and windows. When shopping for doors and windows, be sure to ask whether the insulated glass is made with float glass and what its specific thickness is. As for the exact specifications of the door’s insulated glass, these are usually determined based on the window model being installed.
Double-glazed glass
For example, take the 60-series model of broken-bridge aluminum doors and windows—these use 5+18A+5 float glass in their insulated glazing units. In contrast, the 65-series model features 5+22A+5 float glass, while the 70-series model is equipped with 5+27A+5 glass. Here, the numbers 18A, 22A, and 27A specifically refer to the air gap distance between the two panes of glass in the insulated unit—a standard configuration for insulated glass used in broken-bridge aluminum doors and windows.
When consumers are inquiring about doors and windows, the first thing to clarify is whether float glass is being used. Next, they should check if the glass is 5mm thick—because some unscrupulous suppliers may cut corners by opting for 4mm float glass instead. As for the spacer distance in insulated glass units, there’s no need to worry about that either, since if you’re choosing a 60-series thermal-break aluminum frame, the standard insulated glass unit will naturally have a 18A spacer, not 22A. After all, the window frame simply isn’t wide enough to accommodate a 22A spacer.
Aluminum-clad insulated doors and windows represent the weakest link in a building's entire envelope system—particularly when it comes to thermal insulation, heat retention, soundproofing, and security. Heat loss through doors and windows typically occurs via three main pathways:
(1) Thermal conduction between door and window frames/panels and the glass;
(2) Air infiltration and heat exchange between door and window frame sections, between the sash and glass, and between the frame and wall surfaces;
(3) Thermal radiation from window glass. According to relevant data, energy loss through doors and windows accounts for approximately 50% of a building’s total energy consumption, with about 75% of this loss occurring specifically through the glass. Under certain conditions, thermal radiation and conduction through glass become the dominant factors contributing to energy loss inside the building.
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