What does Low 'E' for window glazing represent? Low-emissivity is a coated glass product which reflects heat. Because it is applied in a molten glass stage, it can be used on a single pane as well as an insulated glazing unit, and is referred to as a hard coat.
Contrariwise, the Low E squared or Low E cubed are glass coatings applied by the sputter-coat method and must be used on the interior of an insulated glazing unit. These latter coatings are often referred to as soft-coat.
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