Temperable high shading performance coatings

An insulating glass unit comprising first and second panes held in a spaced-apart configuration, the panes having confronting inner surfaces oriented toward a between-pane space and opposed outer surfaces oriented away from the between-pane space, one of said inner surfaces bearing a tempered high shading performance low-emissivity coating comprising first and second infrared-reflective films and first and second high absorption blocker layers positioned respectively directly over the first and second infrared-reflective films, the first and second high absorption blocker layers comprising niobium, said coating including a middle coat comprising a transparent dielectric nitride film deposited directly over the first high absorption blocker layer and including an outer coat comprising a transparent dielectric nitride film deposited directly over the second high absorption blocker layer, the insulating glass unit having a total visible transmittance of less than about 0.45.

An insulating glass unit comprising first and second panes held in a spaced-apart configuration, the panes having confronting inner surfaces oriented toward a between-pane space and opposed outer surfaces oriented away from the between-pane space, one of said inner surfaces bearing a tempered high shading performance low-emissivity coating comprising first and second infrared-reflective films and first and second high absorption blocker layers positioned respectively directly over the first and second infrared-reflective films, the first and second high absorption blocker layers comprising niobium, said coating including a middle coat comprising a transparent dielectric nitride film deposited directly over the first high absorption blocker layer and including an outer coat comprising a transparent dielectric nitride film deposited directly over the second high absorption blocker layer, the insulating glass unit having a solar heat gain coefficient of less than about 0.4.