Mylar® MO21 Film

Image of Mylar® MO21 hazy polyester film

Mylar® MO21 thick-gauge polyester films have excellent dielectric properties which make them ideal for insulation in motor and generator end uses, including slot liners, wedges, and phase insulation. These films also offer exceptional cut-through resistance, low shrinkage, low moisture absorption, and high thermal durability. Product uniformity enhances processing on automatic slot and wedge insertion equipment. They are also frequently used in hermetic motor/compressor sealed units, fractional horsepower motors, diaphragms, and industrial laminations. Available in 7.5, 9, 10, 12, and 14 mil thicknesses, or in a 5 mil thickness in the form of Mylar® MO.

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  • Mylar® MO21 7.5 mil (187.5 micron)
  • Mylar® MO21 9 mil (225 micron)
  • Mylar® MO21 10 mil (250 micron)
  • Mylar® MO21 12 mil (300 micron)
  • Mylar® MO21 14 mil (350 micron)


  • Excellent dielectric strength
  • Good moisture and chemical resistance
  • Great thermal stability and durability in high-temperature environments
  • Strong mechanical properties
  • Flexible

Typical Applications

  • Slot liners, wedges, phase insulation, diaphragms, industrial laminations, and other electrical insulation in motors and generators
  • Usage in motor/compressor sealed units and fractional horsepower motors
Data Sheets & Summary Sheets

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