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low-e coating location in IGU insulated glass unit
- Oct 05, 2018 -

 In a standard double panel IG there are four potential surfaces to which coatings can be applied:

the first (#1) surface faces outdoors,

the second (#2) and third (#3) surfaces face each other inside the insulating glass unit and are separated by a peripheral spacer which creates an insulating air space,

the fourth (#4) surface faces directly indoors.

Passive low-e coatings function best when on the third or fourth surface (furthest away from the sun), 

solar control low-e coatings function best when on the lite closest to the sun, typically the second surface.