Low-e coating
Also called low-emissivity coating
An invisible metal coating on a pane that reflects heat.
A low-emissivity coating is a microscopically thin layer of metal or metal oxide, applied to one of the surfaces facing the gap. It lets visible light through but reflects heat, keeping warmth in during winter or out during summer, depending on which surface carries it.
It is put inside the gap because it is soft and would wear off outside.
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Related
- Gas fillThe gas trapped in the gap between the panes.
- LiteA single sheet of glass in an insulating glass unit.
- Insulating glass unitTwo or more panes of glass sealed together around a gap that insulates.