Mylar® polyester film and sheet properties

Mylar® brand Film or Polyester Film is ideally suited for a wide range of uses such as packaging, printing, die-cutting, electronics, protective overlay, barrier protection, apparel and other industrial applications. Because of Mylar® brand Film or Polyester Film inherent physical properties, it’s your best choice for a high performance plastic film/sheet.

Physical Properties
PropertiesTypical ValueUnitsTest Method
Tensile Strength (MD)28,000psiASTM-D882
Tensile Strength (TD)34,000psiASTM-D882
Strength Elongation MD15,000psiASTM-D882
Strength F-5 TD14,000psiASTM-D882
Modulus MD710,000psiASTM-D882
Modulus TD740,000psiASTM-D882
Elongation MD115%ASTM-D882
Elongation TD92%ASTM-D882
Surface Roughness38nmOptical Profilometer


Electrical Properties
PropertiesTypical ValueUnitsTest Method
Dielectric StrengthAC, 20º C, .00092″7,000volts/milASTM-D149-64
Dielectric Constant25º C, 1kHz3.2n/aASTM-D150-81
Dissipation Factor25º C, 1kHz0.005n/aASTM-D150-65
Volume Resistivity25º C1.00E+19ohm-cmASTM-D257-78
Corona ThresholdV-ACV-ACASTM-D2275-80


Thermal Properties
PropertiesTypical ValueUnitsTest Method
Melting Point254º Cn/a
Dimensional Stabilityn/an/an/a
at 105º C MD0.6%n/a
at 105º C TD0.3%n/a
at 150º C MD1.8%n/a
at 150º C TD1.0%n/a
Specific Heat0.28cal/g/º Cn/a
Thermal Expansion1.7 x 10-5in/in/º CASTM-D696
UL94 Flame Class94VTM-2n/aSlow to self

Polyester Film has a variety of different applications. Click here for more information.

Grafix Plastics offers a wide variety of different types, grades, finishes and thicknesses. Click here for more information on Grafix Plastics Polyester Film Products.

Ready to talk with us?
Please click the start an inquiry button, and we’ll help you solve your plastic materials problems.

Mylar® is a registered trademark of Dupont Teijin Films. Only Dupont Teijin Films makes Mylar®. Grafix Plastics stocks some Mylar® brand products so please contact us for more information.

Privacy Preference Center


Necessary cookies make any website usable by enabling basic functions like page navigation. The website cannot function properly without them.



Statistics cookies help us understand how visitors interact with our website by collecting and reporting information anonymously.