- A thin, tough, smooth polyester film used as a drafting medium.
- A strong, resistant, and thin polyester film utilized as a substrate for magnetic recording media, such as tapes and diskettes. It is also used as an insulator, as a dielectric in capacitors, and in making protective bags and sleeves. Also called mylar film.
(written as Mylar)a trade name for a thin strong polyester film used in recording tapes and photography