Start by confirming whether the figures describe film-only or film installed on a stated glass. Then compare VLT, UV wavelength coverage, IRR test point or range, TSER, solar reflectance, absorptance and transmittance. A complete data sheet is more useful than one headline percentage.
Confirm the test system
The same film can produce different combined results on different glass. Look for the substrate, test method and whether the number applies to the film itself or the completed glass-and-film system.
Read performance values together
VLT affects brightness and visibility. TSER indicates total solar rejection. Reflectance, absorptance and transmittance explain where the solar energy goes. UV and IRR claims require a wavelength or range.
Match the data to the application
Automotive visibility rules, building façade appearance, glass type, orientation and occupant needs can change the appropriate specification.
Frequently asked questions
What is VLT?
Visible Light Transmission is the percentage of visible light passing through the measured film or glass-and-film system.
Why must the original glass be considered?
Original glass already has its own transmission, absorption and reflection characteristics, which affect the final combined result.