UV protection film for windows: what it protects and how to choose

UV protection film for windows helps reduce the harmful effects of solar radiation: interior fading, material ageing and UV radiation entering the room. But not all films are the same – the right choice depends on the glass, the film's technical specifications and the desired result.

What is UV protection film?

UV protection film is a thin film applied to existing glass, designed to reduce the transmission of ultraviolet (UV) radiation through the glass. UV radiation is one of the factors affecting interior fading. Fading is also influenced by visible light, heat, material properties and duration of exposure – no film eliminates fading completely (IWFA explanation).

Depending on the product, a quality UV protection film can reject up to 99% of UV radiation. The exact result is stated on each film's technical data sheet – different models have different specifications, so always check the specification of the chosen product.

Why might window glass alone not be enough?

Different glasses and glass units filter UV radiation differently. Protection is affected by the glass type, thickness, coatings and unit construction, which is why the existing glass must be assessed before choosing a film.

UV protection film adds a special layer to the glass, designed specifically to reject UV radiation – this way existing glass can be upgraded without replacing it.

What does "up to 99% UV rejection" mean?

This figure describes the proportion of measured ultraviolet radiation that the film and glass combination blocks. If the technical data sheet shows UV transmission below one percent, it means less than one percent of the measured UV radiation passes through.

"Up to 99%" should not be used as a general promise for all window films. Before choosing, check the specific product's technical specifications and which glass they were measured with. For example, the Solar Screen Chrome 245 XC technical data shows UV transmission below 1% (Solar Screen Chrome 245 XC). Other films' specifications must be checked on the respective product's data sheet.

What is the difference between UV protection film and solar control film?

The terms partly overlap, but the emphasis differs. UV protection focuses on protecting the interior from fading – this is high on most quality films (up to 99%). Solar control (heat rejection, TSER) focuses on reducing room overheating, which is a separate technical figure.

Many solar control films for windows offer both – high UV protection and heat rejection. If the main goal is only interior protection, a film with a strong UV figure is enough; if you also want a cooler room, look at the solar rejection (TSER) figure as well.

Which technical specifications should you compare?

If you need help comparing specifications, read our practical guide to choosing a film.

Which windows can film be applied to?

UV protection film can be applied to most common glass surfaces: single glazing, double glazing units, tempered glass and most modern windows. Suitability depends on the glass type, thickness and condition – the installer always assesses the glass before the work.

For some special glass (e.g. certain selective glasses or glass already coated with film), suitability must be checked separately to avoid the risk of glass overheating.

Professional installation and care

The result of UV protection film largely depends on the quality of installation. Professional installation ensures the film is free of bubbles and dust, cut precisely to the glass size and applied evenly. The work begins with thorough glass cleaning and ends with a result check.

Care is simple: the film can be cleaned with a soft cloth and a gentle cleaning agent. Abrasive materials and sharp objects should be avoided. Properly installed and maintained film lasts for years.

Frequently asked questions