Double glazing unit (DGU) optical & thermal property testing procedures
Double glazing units (DGUs) are glazing systems consisting of two single glazing panes and one gas space (e.g. air or argon).
Instead of testing the DGU assembly directly, the two single glazing panes are separated and tested one by one, according to the identical procedures of testing standalone single glazing glasses. The gas space is not physically tested, and only considered in the calculation.
Step 1. Separation of DGU into standalone outer pane and inner pane