Radio and TV Antennae in the Glass
A number of vehicles have radio, TV and mobile phone antennas built into or applied on the inside of the glass, usually the rear screen, but also the side rear glass in vehicles such as the Subaru Forrester, Mazda 6 and Honda Accord amongst others.
Other vehicles have keyless locks and GPS systems and it appears that some types of film can cause interference to reception (or transmission) in such vehicles. From our experience, Tint Works films have not been shown to interfere in these vehicles, however, it may be prudent to use a non-metallised film such as Carbon if you are in doubt.
Carbon’s non-metal construction makes it the perfect film to avoid signal disruption. Manufactured with the newest color-stable technology in dyed films, Carbon is durable, long lasting and provides enhanced UV radiation protection.
Applications of Film to Plastics
Window film should not be applied to acrylic or polycarbonate windows, unless it is specifically designed for that purpose. These are plastic sheeting products and they all have the potential to out-gas. Heat and visible light form the sun cause “out-gassing” which is the release of chemical components and or moisture absorbed by the plastic. This out-gassing interferes with the window film’s adhesive system and results in bubbling between the plastic sheet and the film. It should also be noted that many window film adhesive systems, when applied to plastics will create a permanents bond, and in the event that the film should have to be removed, it will be almost impossible to do without damaging the surface of the plastic sheet.
Solar control window film should not be applied to the interior surface of wired glass. The wire contained within the glass absorbs heat and if film is installed on the interior surface, the heat reflected out of the film greatly increases the heat absorption of the wire, leading to a high rate of expansion. The wire expands to a point that the glass can no longer withstand, resulting in spontaneous glass breakage. In cases where it is necessary to install solar control window film wired glass, the film should be applied to the exterior surface of the glass, using exterior window film.
Tinted glass is a major absorber of heat, and leads to a great deal of stress within the glass. Window film itself absorbs a certain amount of heat and if the combined absorption of the window film and tinted glass is very high, this can result in the glass cracking as a result of thermal stress. Thermal stress may occur if the sheet of glass has not been installed with the appropriate amount of care, i.e. the setting blocks have been omitted or the edge of the glass is damaged. In cases where tinted glass is tempered the application of window film is unlikely to result in the glass cracking or fracturing.
Patterned or Textured Glass
Patterned or textured surfaces will not allow film adhesive to form an adequate or appropriately strong bond to the glass surface. Obviously, the type and degree of texture or pattern will influence this. In some cases, if the texture is minimal, it may be possible to install window film, but this is not recommended, as the adhesive bond will probably be inadequate. In most cases, this type of glass is installed with the smooth side facing the exterior of the building, and if this is the case, there is no reason why exterior window film can not be installed on that surface.
It should be noted that the thickness of the glass does increase its absorption, and subsequently must add stresses. The amount of stress induced will depend on the glass type, thickness, and the film type selected. If failure is to occur, the stress in the glass must exceed the available edge strength of that glass.
Homes & Buildings under Renovations
Window film should generally be installed in new or renovated buildings only when all other work has been concluded. There are many reasons for this. There is little sense in applying window film to windows that have frames that may need to be painted; leading to paint splatters on the film itself. Other reasons could be the potential for damage to the film due to the high amount of activity in a construction environment. Also, in many cases, there is a high level of dust and particles such as carpet fibers in construction areas that could become trapped between the glass and the window.
The application of window film to skylights is much more restricted versus vertical glazing systems. If the film is installed on the outside surface of the skylight, it may have a shorter life span. This is due to the fact that most skylights accumulate moisture as the result of rain, snow or humidity. This moisture, either in standing from or as a result of condensation, is likely to lead to a rapid breakdown of the film’s construction, and in the case of metallised film, subsequent demetallisation.