What makes a window film heat protective?

By 2019-03-28 Egyéb No Comments

The glass structure transmits the solar range of the radiation coming from the sun (280-2500 nm). This range includes one part of UV radiation, the whole of visible light and a portion of infrared radiation. From the point of view of energetics, it is interesting that irradiating energy consists of visible light (47%) and infrared radiation (53%). Each automotive window film can filter visible light with a simple colouring – of course, these films are also capable of energy protection, but their infrared filtering is negligible (about 12%). It is very important to highlight that infrared radiation penetrates deeper into the layers of the skin than visible light, so it excites receptors more, therefore creates a much more intense feeling of heat. By strongly filtering infrared radiation, the sensation of heat coming from the sun can be minimized. This is the reason for the fact that films which can filter in the infrared range are called heat protective.

The first, entry level of heat protection films consists of dyed and aluminium-metallized films, commonly called the High Performance series (thus the name SkyFol HP). These films have an aluminium-matellized layer with 60% light transmission, which is laminated with deep-dyed layers. The infrared protection of these films might vary depending on the thickness of the metallic layer, but in their most general form, they can perform around 40-45%. A further increase in the metallic layer would mean more reflectivity and would impact the ease of installation in a negative way.

All Metal films belong to the next category. These slightly reflective nickel-chrome films usually have a neutral appearance. Unfortunately, even such reflectivity (12-15%) is not permitted by Hungarian regulations, therefore these films cannot be installed. For all metal films, infrared protection is directly proportional to the darkness of the film, since it is only affected by the metallic quantity. They are durable products with good heat protective characteristics, but with some reflectivity. The level of infrared filtering is around 50-80%, depending on the light transmission value.

The manufacturing technology of ceramic (SkyFol NT) films is very similar to All metal ones – the difference is in the raw material, which in this case is titanium-nitrate. Ceramic films are available in a wide range of qualities, and they are also often laminated with carbon-based colouring, which is capable of a limited level of infrared filtering, based on film darkness. Ceramic films have outstanding heat protection with infrared filtering of 60-80%.

The last category from a heat protection point of view if that of IR-absorbing films. The technology was developed in Japan – its basis is a special particle capable of absorbing infrared radiation. The SkyFol NT Pro series comes from this manufacturer (Lintec – Madico). The infrared filtering of such products can be up to 99%. It is important to note, however, that the IR films of a lot of manufacturers filter only a certain part of the infrared range. The best example for this is a group of films which filter at 900 nm – the measurement range of hand-held devices is 900 nm, so some manufacturers also distributed such devices. SkyFol NT Pro films can filter in the whole infrared range.

To summarize, don’t be fooled if they promise to sell you a heat protective film for 20,000 HUF, or the best film for 40,000 HUF. If possible, avoid Chinese and Korean films, because their production is not consistent, and although they write down anything, the reality is often completely different.

If you would like to have a heat protection film on your car (which is the only choice that is worth it), go for at least the SkyFol HP series, if possible with a darker shade, so the infrared filtering of the film of about 40-45% is supported by filtering visible light as well. The SkyFol HP series is an economical solution. If you don’t want any compromises or if you would like to have a lighter film, choose the SkyFol NT series with an infrared filtering of 60-80%. If money is not an issue, we strongly recommend the NT Pro series with an infrared filtering of 92% – this is like a good steak: once you had it, you’ll never want anything else.

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