Vacuum Insulated Glass (VIG) is a thermally insulated glass unit consisting of two pieces of glass that are hermetically sealed around the edges. All the air is evacuated prior to sealing, thus creating a vacuum. It is this vacuum as well as a good low-E coated piece of glass that creates exceptional thermal performance. The vacuum results in reduced conductive and convective heat exchange between the panes of glass, while the low-E coating reduces the radiative heat transfer. This means that the heat transfer through vacuum glazing is considerably less when compared to traditional double-and triple-glazed units (IGU’s), and therefore significantly higher thermal efficiencies are attained.

Vacuum bottles are popularly used to keep hot drinks hot and cold drinks cold. But how exactly do they work? Vacuum flasks consist of two walls, with a vacuum in between them. This means that there is no air or other gas in the space between the walls, which prevents heat transfer by conduction or convection.