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[DuPont Teijin Films, Hopewell, VA] A registered trademark for a series of optically clear, colorless, thermoplastic polyester films. First introduced in the early 1950s, Mylar® is composed of polyethylene terephthalate. It is a biaxially oriented film that is chemically inert and dimensionally stable. Mylar® is an effective barrier to moisture, oil and grease. It has been used for lamination, coating, embossing, printing, and dyeing. Mylar® has been also used for heat seal packaging. Mylar® type D sheets are uncoated and have been used for enclosing photographs and coins as well as for making photocorners.

Note: Mylar® type D sheets were discontinued September 2001 by DuPont


Synonyms and Related Terms

PET; Mylar® [Du Pont]; Hostaphan® [Mitsubishi]; Claryl® [Toray]; 3M Polyester® [3M]; Questar® {Filmquest]; polyesterr; polyethylene terephthalate; tereftalato de polietileno (Esp.)

Other Properties

Resistant to cold acids, weak alkalis, bleach and most organic solvents. Degrades in strong alkalis, strong hot acids, cresol.

For a 1 mil film: Oxygen transmission = 19-32 ml/m2d; Water vapor transmission = 45-60 g/m2d;

Melting Point 250-260
Density 1.38
Refractive Index 1.54, 1.72
Rolls of Mylar film

Hazards and Safety

Difficult to ignite. Burns with a shiny, yellow-orange, sooty flame. Self-extinguishing.

Additional Information

DuPont Teijin: Website

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 625
  • Marjorie Shelley, The Care and Handling of Art Objects, The Metropolitan Museum, New York, 1987
  • Caring for your Collections, Arthur W Schulz (ed.), Harry N. Abrams, Inc. , New York, 1992
  • Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002
  • Marjory L. Joseph, Introductory Textile Science, Holt, Rinehart and Winston, Fort Worth, TX, 1986
  • Identification of Textile Materials, The Textile Institute, Manchester, England, 1985
  • Teri Hensick, contributed information, 1998