Shading Coefficient

Shading coefficient (SC) is the older of the two main solar performance metrics; SHGC (Solar Heat Gain Coefficient) is the more modern replacement. Both measure how much of the sun's energy passes through a window into the room or cabin.

SC = 1.0 corresponds to a single pane of clear 3 mm glass. A film with SC 0.40 transmits 40% of the heat that bare glass would. Architectural film and commercial glazing specifications still use SC frequently.

For automotive applications, total solar energy rejection is more useful because it accounts for energy absorbed and re-radiated by the film. SC and SHGC are more common in architectural film spec sheets.