Does Car Film Continuously Release Formaldehyde?
2 Answers
Car film does not continuously release formaldehyde; it typically dissipates within about half a month. Classification of car films: 1. Composite process film: Its main function is to block intense sunlight. This is an earlier type of car film, which basically lacks heat insulation capabilities. It was initially called sun paper or tea paper. 2. Dyed film: Most dyed car films on the market use deep-dyeing techniques, incorporating heat-absorbing agents through deep-dyeing methods to absorb infrared rays from sunlight for 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. 3. Vacuum thermal evaporation film: This type employs vacuum thermal evaporation technology, where an aluminum layer is evaporated onto the substrate to achieve heat insulation effects.
Car films typically do not continuously release formaldehyde; significant release occurs mainly during the initial stage. I had this experience when I first applied the film—new films contain adhesives and chemical coatings, and the strong smell right after application is due to formaldehyde off-gassing. This substance is part of volatile organic compounds (VOCs), and its release increases with higher temperatures. However, the release rate drops rapidly over time, usually becoming undetectable within a few weeks to months. It's advisable to ventilate the car frequently after applying a new film, especially by driving with windows open during hot summer days. If concerned, opt for products labeled with low-VOC certifications, as these have short-term but manageable health impacts. Overall, it’s not a permanent issue, so you can use it with peace of mind.
