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What is Mylar? Or what does Mylar mean? The basic info for Mylar is that is a thin polyester film manufactured by DuPont Teijin Films. According to the Encyclopedia Britannica, strong synthetic fibers of polyethylene terephthalate are stretched and used to produce Mylar. Since its invention in the early 1950s, Mylar has been used in a broad array of fields, having several applications in electronics, magnetic media, imaging and graphics, industrial and packaging markets. In this article, we will introduce the Top 4 Mylar applications. Top 1: Insulation function Mylar is made reflective or metalized by sputtering a thin film of metal onto its surfaces. Much like aluminum foil, the reflective Mylar has one shiny side and one dull side. This type of Mylar is less permeable to gasses and reflects up to 99 percent of light, which is why it is often used in insulation. If used in a cold environment, place Mylar inside the structure with the shiny surface facing inward to reflect escaping