3M belongs to the fifth generation automobile film, which is a ceramic film. It is a kind of heat insulation film which is different from the traditional metal or dyeing process. It is called "IR film" or "endothermic" film internationally. Coatings containing ITO\ATO (metal oxide powder) strongly absorb infrared rays and ultraviolet rays. Compared with metal film, it solves the problems of oxidation and shielding of metal layer, but the absorbed heat will be lost when it reaches a certain saturation.

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