3.2.3 Significant Side

The term “Significant Side” is used if there is a necessity to distinguish which side of a glass pane is “up” or “down” or “front” or “back” while processing the glass pane. Typical examples are:

When producing flat glass, one side is floating on the tin bath, the other is exposed to the gas fire heating the chamber.

If the glass is coated (a thin metallic layer is applied), it is essential to know which side is coated

Glass having patterns or other surface treatments