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An extremely strong, transparent polyester film made of biaxially-oriented polyethylene terephthalate (PET). Mylar can be made conductive with the addition of indium tin oxide, as well as reflective when an aluminum film is bonded to it. Mylar, developed by DuPont in the 1950s, is chemically stable, extremely heat-resistant, has barrier-like properties against gases and aromas, and is often used as electrical insulation.