Car film does not continuously release formaldehyde; it typically dissipates within about half a month. Car films can generally be divided into three types: composite process film, dyed film, and vacuum thermal evaporation film. Composite process film: Its primary function is to block intense sunlight. This is an earlier type of car film, which basically lacks heat insulation properties. It was initially called sun paper or tea paper. Dyed film: Most dyed car films on the market use deep-dyeing technology, incorporating heat-absorbing agents through deep-dyeing methods to absorb infrared rays from sunlight and achieve heat insulation. However, since it also absorbs visible light, the visible light transmittance is insufficient, and due to inherent process limitations, the clarity is relatively poor. Vacuum thermal evaporation film: This type uses vacuum thermal evaporation technology, where an aluminum layer is evaporated onto the base material to achieve heat insulation. The functions of car film include safety, clarity, anti-glare, heat insulation, and further protection of the privacy of vehicle occupants, enhancing driving safety to a certain extent. After applying car film, a certain amount of formaldehyde is produced. Prolonged exposure to this environment can have adverse effects on health, so timely ventilation and odor removal are necessary to maintain effectiveness. Car film can also help preserve the car's paint.
