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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, G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 625
  • Marjorie Shelley, 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, Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002
  • Marjory L. Joseph, 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, Teri Hensick, contributed information, 1998