Film insulation was first used in the 60s of the last century. Insulation film consists of 3 layers. The surface layer has the effect of shading and insulating, anti-heat. The adhesive layer plays the role of bonding the surface layer to the glass with a special glue layer. Glue protection layer is used to protect the adhesive layer when it is not applied to the glass surface. Although there are many different technologies, basically the insulation film works by the mechanism of heat absorption and heat reflection. With the principle of heat reflection: Heat from the sun transmitted to the film surface will be reflected to the outside environment. This heat will be completely removed. Thereby the film will help reduce the amount of heat transferred from the outside to the inside. With the principle of heat absorption: Heat from the sun transmitted to the film surface will be absorbed by the film on the surface. In general, when sunlight passes through a glass with film, part of it will be reflected back to the environment, another part will be absorbed by the film onto the glass, a low-emissivity layer is arranged on the outside of the film. Heat radiated from the non-permeable glass back into the room. The use of insulating film is to reduce heat from direct sunlight (about 4 – 8 degrees Celsius) thereby cooling the interior air and reducing air conditioning power. Even, in addition to heat resistance, the product is also capable of cutting UV rays. However, experts also know, insulating film also has many disadvantages: looking from the inside out or being dazzled, sore eyes, difficult to feel the true brightness outside. The UV resistance is really not as high as advertised. Another disadvantage is that the insulation ability is easily reduced over time, prone to fading, color fading. In particular, due to exposure to high temperatures, it is very easy to peel, yellow, lose aesthetics and costly to rebuild. The way experts advise, if you choose insulation film to prevent heat for your home, you need to pay attention to indicators such as UV resistance, UV rays and the ability to penetrate light through the glass layer when choosing products. In particular, it is recommended to paste in the early morning and late afternoon when the air and surface temperatures are not too large, reducing the ability of the glue layer to contact the glass. Too high a temperature will blister, the adhesive layer will stick, but it is easy to have air bubbles and quickly peel off. In addition, standard procedures should be followed because the film is very thin and difficult to apply. Film pasting requires the paster to have ingenuity, perseverance and fully follow the instructions. Invite readers to watch the video: Desert greening movement. Source: VTV24.