The amount of solar energy (visible, infrared and ultraviolet) that is reflected by the glazing system, expressed as a percent.
When sunlight strikes glass solar energy is either transmitted through the pane of glass, absorbed by the glass or reflected away from the glass. The type of glass and window film applied causes varying reflectance results, shown as a percent – this is the amount of solar energy that the glass and film rejects away.
For maximum heat rejection, look for films with a high solar energy reflectance rating. Always refer to a manufacturer’s film-to-glass installation recommendation.