very often be supplied with as much as ten years warranty. One of the common misconceptions with dyed film is that it can disperse heat into the property. As dyed films can absorb heat and it's fitted inside it's easy to see why people think this. However most of the heat is held in the glass and because the wind speed outside is so much greater than inside (wind speed averages over 15mph outdoors but only ½ mph indoors) the external air draws the heat outside. Some heat is leaked into the property but most heat is dissipated outdoors. As double glazed units allow no air movement in between the glass, interior dyed films aren't always suitable for this type of glazing and you should make sure that you check on it's suitability before installing as installation on the wrong type of glazing can cause thermal cracking. Deposited window film Deposited window film is created by drawing film through a tank of metal ingots (usually aluminum or nickel chrome, but sometimes copper). Pressure is then reduced in the tank creating a vacuum and the tank is filled with argon gas. When the tank is filled with gas the metal ingots are the heated, the heat causes the metal to give up particles, which in turn migrate to the films surface in an even layer. The density of the metal deposits can be controlled easily by altering the speed of the film through the chamber. Sputtered window film Sputtering is the most complicated procedure for creating window film. This process is also carried out in a vacuum but the metallization in this process is achieved at atomic level. Electromagnetic fields direct streams of ions from a chemically inert gas (usually Argon) towards the metal. This ion bombardment (often referred to as "atomic billiards") causes groups of atoms to dislodge in small bursts and scatter uniformly across the film. The benefits of sputtering are that around 30 different types of metals can be used; various metals can be chosen to subtract specific radiation from the solar spectrum. The metalized coating is much lighter; a sputtered metal can be created in a layer one-hundredth of the thickness of a human hair. The result of sputtering is a highly reflective layer that has very little mirrored effect, heat absorption or colour shift and as such warranties are usually 10 years to lifetime. Sputtering is the most expensive process to achieve and as such sputtered window film is at the higher end of price range
Window Film and Window Tinting.
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