Identification method of building film
Sep 29, 2022
1. Touch. The high-quality film feels thick and smooth, while the low-quality film is very soft and thin, lacking sufficient toughness and easy to wrinkle.
2. Sniff. Pressure sensitive adhesive is usually used for inferior film, which contains a large number of benzaldehyde molecules and will volatilize under sunlight to produce a pungent odor. High quality film has a light fragrance.
3. See. The high quality explosion-proof membrane has high definition, and the perspective performance is good regardless of the color depth, while the poor quality membrane has uneven color.
4. Quality assurance card. Only the film with the manufacturer's quality assurance card can be trusted. The manufacturer's quality assurance card usually includes the quality assurance items, years, compensation methods, and the manufacturer's name, address and telephone number that can be found.
5. Wipe with alcohol, gasoline, asphalt cleaner and other chemical reagents. Because the inferior film is only dyed by the adhesive layer, or the adhesive layer is only coated with an ultraviolet blocking agent, the adhesive layer can be wiped after the protective layer of the film is removed, that is, the fading phenomenon can be seen, or the ultraviolet ray can be greatly reduced by testing with an instrument.
6. Technical parameters. Visible light transmittance, thermal insulation ratio and ultraviolet barrier ratio are the professional terms commonly used by manufacturers to reflect the film performance. The relationship between the three is usually: the more transparent the film, the lower the thermal insulation; The more reflective the film, the higher the thermal insulation. Consumers can use store equipment to measure to see if it is close to the nominal technical parameters.
7. Anti scratch. The surface of high-quality film will not be scratched, blistered and fogged when the window is normally lifted or lowered, while the inferior car film has obvious defects in this respect.
8. Whether the detailed product model, address, telephone, website and barcode of the original manufacturer are available on the outer package and data of the products sold. In addition, it depends on whether the unified publicity signs of the original manufacturer are used. Only authorized dealers can use all the publicity signs of the original manufacturer, otherwise they will be held accountable for infringement; It also depends on whether there is a valid authorized distribution certificate.
