From what I've researched the window film deals with the Reflectance , Absorbance, Transmittance of the suns energy (UV Rays, Visible Light, Infared heat)
So it has to deal with 100% of the energy that passes through it whether its reflected , absorbed or let through, so surely silver, which is a very reflective tint... Will REFLECT the IR rays instead of absorbing it.. The same way it reflects the UV rays and visible light instead of absorbing, how can it all of a sudden be an absorbing window film for just IR? When its properties are reflective and it deals with the other parts of the R.A.T the same? And if it can not have control over the absorption of this. Even if it could not control this. Then why wouldn't they just create the film anyway for single pane glass ?
Sorry if these confuses you, thought it might be quite interesting to answer this considering after 10 years its not been answered