Since the invention of glass, people have worked hard to make this fragile transparent material durable, beautiful and safe (after all, flying fragments can cause a lot of trouble).
Many options for additives used in the production of glass have been tested, providing certain qualities (shock resistance, fire resistance, etc.) and window designs (multilayer reinforced glass, stained glass, etc.).
But the simplest and relatively inexpensive solution was a window film - a material applied to glass and representing a multilayer composite based on lavsan (polyester), a high-molecular-weight synthetic compound. This initially transparent material can be painted in any color chosen by the customer.
In addition, by applying extremely thin layers of various metals (aluminum, silver, gold, titanium, bronze, chromium, nickel, zircon), the film is given certain properties. Manufacturers are able to offer the buyer more than a hundred types of films designed for both protection and decoration.
There are four types of films: sunscreen (tinted), energy-saving, shockproof (armored) and decorative. Many myths have been created about the properties, effectiveness, application and application of window films, which we will try to debunk.
Window film can protect furniture from fading. This is not entirely true. Although window films can retain up to 99% of ultraviolet light (and this property is possessed by both tinted and transparent films) and reduce the thermal effect of sunlight by 78%, they are not able to completely protect furniture from fading. But they can really slow down the process.
The view from a window protected by a window film is distorted - everything seems grayish and indistinct. Indeed, reflective or tinted film makes it difficult for an outside observer to see what is behind the glass of a house, office or car. But such optical limitations are almost invisible when viewed from the inside. Indeed, due to the properties of visual acuity, the human eye gets used to the ambient light and is able to see everything that happens outside the window, without restrictions, even if the film retains up to 70% of the ambient light.
Window film is able to protect against information leakage. It really is. The reflective film will protect against normal visibility from the outside (provided that the lighting level matches or slightly exceeds the lighting level outside the building). A metal-coated film is capable of attenuating or reflecting microwave radiation (for example, hazardous radiation generated by various technical means at frequencies above 200 MHz) and protect against specially organized information leakage channels.
Window film can protect against hard force (bullet, hurricane, etc.). It depends on what kind of glass we are talking about. The glass used during the tests Ѕ "thick with several layers of protective film can really protect you from bullets. Yes, only an ordinary consumer is most often offered a product with slightly different characteristics, and there is usually only one layer of film. Such a film will be a good protection against accidental damage ( hitting the glass of a ball or a stone bouncing off the lawn mower, mechanical impact produced, for example, by a child), from vandalism (scratches, graffiti) or attempts to enter the house of burglars.This film will also protect from strong winds, prevent small objects from entering the room blown into the air by a hurricane, and even during earthquakes, glass fragments will not scatter, held by the film.However, it is unlikely to save your windows from the direct impact of a tornado blowing roofs off houses and lifting cars into the air.
When choosing a window film, keep in mind that, for example, a film with a thickness of 112 to 200 microns is capable of protecting against hooliganism (hit with a small object: bottle, stone, etc.). Films with a thickness of 225 microns and more can detain an intruder for a long time, even using special devices (hammer, ax, etc.). There are also glasses and films of protection class A1 (glass thickness - 4 - 5 mm, films - 300 microns), A2 (film thickness - 412 microns) and A3 (680 microns).
It will always be too hot in a room with a metal-sprayed film applied to the glass. Misconception. After all, films with metal spraying reflect thermal (infrared) rays, as a result of which the room does not overheat in the hot season and minimally loses heat in winter. By using the film, you can reduce heat loss by 20-40% and protect yourself from overheating in the hot season.
If necessary, glass coated with a film (fire-resistant or shockproof) will not be easy to break. In fact, the application of a film of a certain quality can actually localize the fire site, as a result of which the damage from a fire will be significantly less. At the same time, since the film is applied from the outside and serves only to keep the glass fragments from flying apart, the window can be easily broken from the inside (unless, of course, we are talking about special shockproof glass that can withstand many types of mechanical stress).
You can also apply the window film to the glass yourself. Indeed, this process is simple, but you should take into account some features that can have a negative impact on the result of the work. For example, the film can easily be stained, making it unusable. Therefore, it is best to consult with experienced professionals familiar with the various methods of preventing film application problems.
Car glass tinting is illegal. In fact, the laws regarding glass tinting are different in each country. For example, in some states certain light transmission standards are set (not lower than 75% for the windshield and 70% for the front side windows), while it should be taken into account that damaged, scratched glass initially has a light transmittance of less than 100%. In the USA, it is forbidden to tint the windshield, but the side and rear windows - please, as much as you like. Therefore, if you are going to tint the windows of your car, be sure to check with your dealer whether it is legal to apply a film with certain properties in this particular case, or read the relevant laws on tinted glass.
Applying a film to car glass is a lengthy procedure. Much depends on the car model and the amount of work, but, in any case, a qualified specialist will spend no more than one and a half to two and a half hours.
The film is applied to automotive glass from the outside. A completely erroneous opinion - the film is applied from the inside, from the outside, only the glass is heated for a better fit and more even shrinkage, and the film is cut.
Immediately after the application of the window film, the quality of the work of the specialists can be assessed. It should be noted that immediately after applying the film, the glass appears cloudy due to small water bubbles. This process (which is an integral part of gluing) is called "shrinkage". It takes up to 30 days for complete shrinkage (i.e. the disappearance of haze), and it all depends on the weather conditions and the type of film (heavy protective films with spraying dry the longest). The duration of the process is explained by the fact that the water remaining after application and causing turbidity must evaporate through the film. Therefore, the quality of work should be assessed only after the final shrinkage of the film.
Glass covered with a protective film can be washed and cleaned after a day. No, you shouldn't rush. The film can be cleaned only after complete drying and shrinkage, using ordinary soap solution (best of all, not very concentrated) or any glass cleaner, even containing ammonia (however, this substance should not be left on the film for a long time). Abrasive cleaners and industrial concentrated glass cleaners are not suitable for cleaning the film, and you should not use window cleaning tools that can scratch the finish.