What Does The Thickness Unit 'mil' For Car Window Film Mean? Is A Thicker Film Always Better?

"Mil" is a thickness unit; 1 mil = 0.0254 mm. The typical thickness of window film substrates ranges from 1.5–2 mil, while PPF films usually range from 6–8 mil. A thicker film is not necessarily better – excessively thick films can increase installation difficulty, may cause edge warping, or shorten the service life of the window lifting motor. Impact resistance depends more on the substrate's toughness and the quality of the adhesive layer than solely on thickness.