Which side of a glass pane is coated or `prime` or `front`?

[christoph-maurer]

The prime surface can be defined in a description as string or with a reference to a document. If there is no such description, it is recommend to assume that the non-prime surface faces the exterior and is uncoated. The prime surface is then the coated surface facing the interior of the building.

The terms front and back could be used for this typical situation. But of course, coated glass panes can also be "flipped" for the installation. Therefore, we use non-prime and prime instead of front and back.