Silver reflective metallized window films, as well as their alternatives with a coloured lamination are generally called reflective films. These products contain aluminum, which is incorporated onto the polyester surface via a vapour deposition process. This is a cheap and efficient procedure, hence these generally are the least expensive window films. The technical parameters of the film are determined by the thickness of the metallic layer, as in their basic form, no other layer is present. The most widely used versions has a visible light transmission of 15%, 20%, 35% and 50%, but technically production is possible with VLT values in the range of 0-80%. There are films laminated with a coloured layer as well, where the coloured layer is laminated onto the silver reflective film – the coloured side will look towards the outside; dual reflective films are manufactured using a similar process, but in this case the coloured side in inside – more on this issue in part 4). Coloured films are recommended only if absolutely justified, because the heat absorption of such films is generally higher, and also because the coloured film will inevitably get fainter as time passes.
Reflective films in SkyFol’s range are called SI (Silverall). In their coloured version, bronze, blue, green and gold films are available.