Does window tint block UV rays?
BEAK Automotive · Updated November 8, 2026
The short answer
Yes, good window film blocks about 99% of UV, and that doesn't depend on how dark it is: a light 70% ceramic film blocks UV as well as limo tint. It matters because car side windows are plain tempered glass, which lets through far more UVA than the laminated windshield. Look for a film that states its UV blocking, rather than going by darkness.
Windshield vs side windows
Windshields are laminated, with a plastic layer that blocks most UVA. Side and rear windows are usually tempered glass without that layer, so they let much more UVA through. A 2016 study of 29 cars found windshields blocked about 96% of UVA on average, but side windows only about 71%.
Shade and UV are separate
The tint percentage is about visible light. UV blocking comes from UV absorbers in the film, so a clear-looking film can block as much UV as a dark one. That's useful in states with strict front-door limits: 70% ceramic still adds UV protection to the front windows.
Who benefits most
- People who drive a lot in the daytime, on the driver's side especially
- Kids in the back seat
- Anyone advised by a doctor to limit sun exposure
The honest downsides
- Tint isn't a substitute for sunscreen on long drives, and an open window lets UV straight in.
- UV figures in marketing come from the film maker's lab tests.
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